Guillaume-Schack arrived in England in 1886.
She met Friedrich Engels, who found her pleasant, intelligent and amusing company, but was suspicious about the links she had made outside the socialist movement.
He wrote of her earlier abolitionist activities, "in pursuing it she is in league with the religious bourgeois ladies of the Anti-Contagious-Disease Acts Agitation and with sundry anarchist elements in the Socialist League."
He also looked down on women, writing that as soon as they began to disagree with each other they would tell tales about party activities, and might go as far as denouncing their comrades to the police.
In July 1885 Engels wrote to Guillaume-Schack "it is my conviction that real equality of women and men can come true only when the exploitation of either by capital has been abolished and private housework has been transformed into a public industry.

Engels disliked resolute and intelligent women who were not pretty and whose surname was not Marx.

He particularly disliked middle-aged female intellectuals such as the theosophist, Annie Besant, the journalist, Emily Crawford, and Gertrude Guillaume-Schack.

Engels greeted the campaign for women's suffrage with scorn, writing of, "these presumptuous little women who make so much noise for the rights of women", saying their cause was a diversion behind which class rule would continue to thrive.

Guillaume-Schack broke with Engels in 1887.
A dispute over Edward Aveling was said to be the cause.

In 1887 Guillaume-Schack spoke in opposition to the official SDP position on protective legislation for women.
She became sympathetic to the anarchists of the Socialist League.

She was active in the Socialist League from 1887–90 and participated in the International Socialist Workers Congress of Paris on 14 July 1889 as a representative of the International Working Men's Club.


In 1895 Guillaume-Schack attended the committee meeting of the Women's Franchise League in Aberystwyth together with Ursula Mellor Bright, Mrs Behrens, Esther?
Bright, Herbert Burrows, Dr Clark MP, Mrs Hunter of Matlock Bank, Jane Brownlow, Mrs E. James (who lived locally), H.N.Mozley, Alice Cliff Scatcherd, Jane Cobden Unwin and Dr and Mrs Pankhurst.

Guillaume-Schack became interested in theosophy around the end of the nineteenth century.

She died on 20 May 1903 in Surbiton, aged 57.

Gertrude Guillaume Schack was described in a coroner's inquest as a Theosophist, Socialist lecturer, temperance advocate, and a strict vegetarian.

About twelve months earlier she had fallen over a tin box in her bedroom and injured her breast.

She had consulted a former doctor whose name had been removed from the register, but in whom she had great faith.
He had urged her to see a specialist, but she had refused, saying as a theosophist she saw death as just a transition from one state to another, and would not have any interference with her body.

A doctor was called in a few hours before her death, but her condition was too far advanced for him to be able to offer any treatment.

The cause of death was recorded as cancer of the breast, accelerated by want of proper surgical dressing and food.
Guillaume-Schack arrived in England in 1886. She met Friedrich Engels, who found her pleasant, intelligent and amusing company, but was suspicious about the links she had made outside the socialist movement. He wrote of her earlier abolitionist activities, "in pursuing it she is in league with the religious bourgeois ladies of the Anti-Contagious-Disease Acts Agitation and with sundry anarchist elements in the Socialist League." He also looked down on women, writing that as soon as they began to disagree with each other they would tell tales about party activities, and might go as far as denouncing their comrades to the police. In July 1885 Engels wrote to Guillaume-Schack "it is my conviction that real equality of women and men can come true only when the exploitation of either by capital has been abolished and private housework has been transformed into a public industry.
Engels disliked resolute and intelligent women who were not pretty and whose surname was not Marx.
He particularly disliked middle-aged female intellectuals such as the theosophist, Annie Besant, the journalist, Emily Crawford, and Gertrude Guillaume-Schack. 
Engels greeted the campaign for women's suffrage with scorn, writing of, "these presumptuous little women who make so much noise for the rights of women", saying their cause was a diversion behind which class rule would continue to thrive.
Guillaume-Schack broke with Engels in 1887. A dispute over Edward Aveling was said to be the cause.
In 1887 Guillaume-Schack spoke in opposition to the official SDP position on protective legislation for women. She became sympathetic to the anarchists of the Socialist League.
She was active in the Socialist League from 1887–90 and participated in the International Socialist Workers Congress of Paris on 14 July 1889 as a representative of the International Working Men's Club.

In 1895 Guillaume-Schack attended the committee meeting of the Women's Franchise League in Aberystwyth together with Ursula Mellor Bright, Mrs Behrens, Esther? Bright, Herbert Burrows, Dr Clark MP, Mrs Hunter of Matlock Bank, Jane Brownlow, Mrs E. James (who lived locally), H.N.Mozley, Alice Cliff Scatcherd, Jane Cobden Unwin and Dr and Mrs Pankhurst. 
Guillaume-Schack became interested in theosophy around the end of the nineteenth century.
She died on 20 May 1903 in Surbiton, aged 57. 
Gertrude Guillaume Schack was described in a coroner's inquest as a Theosophist, Socialist lecturer, temperance advocate, and a strict vegetarian. 
About twelve months earlier she had fallen over a tin box in her bedroom and injured her breast.
She had consulted a former doctor whose name had been removed from the register, but in whom she had great faith. He had urged her to see a specialist, but she had refused, saying as a theosophist she saw death as just a transition from one state to another, and would not have any interference with her body.
A doctor was called in a few hours before her death, but her condition was too far advanced for him to be able to offer any treatment.
The cause of death was recorded as cancer of the breast, accelerated by want of proper surgical dressing and food.
Gertrude Guillaume-Schack