On 25 February 2019, Montgomery announced via The Amorettes' Facebook page that bassist Heather McKay and drummer Hannah McKay had amicably parted company with the band.
In June, Hannah McKay joined Scottish hard rock band She Burns Red.
She left in July 2020, having recorded the "Take Back Tomorrow" EP with them.

On 7 March, a new quartet lineup of the band was announced, as Montgomery joined forces with the rhythm section of UK-based rock trio Tequila Mockingbyrd, who had recently parted company with their guitarist/vocalist.
The remaining members of both bands combined in order to fulfil all their touring commitments.
Drummer Josie O'Toole and Australian bass guitarist Jacinta Jaye joined Montgomery in The Amorettes, alongside Laurie Buchanan from Aaron Buchanan & The Cult Classics as rhythm guitarist.
The same four musicians were also to perform throughout 2019 at Tequila Mockingbyrd shows, with Montgomery on vocals and guitar.
Buchanan played bass guitar for the first few Amorettes shows while Jaye was away in Australia.

The first show for the new line-up of Montgomery, O'Toole and Buchanan was in the Netherlands on 20 April, as the band returned to the Dijkrock Festival.
The same trio performed in support of Terrorvision at four shows across England from 2–5 May. The first Amorettes show as a quartet, with Jaye joining on bass guitar and Buchanan switching to rhythm guitar, was at the Osteguna Rock Festival in Vitoria-Gasteiz, Spain on 20 June.
The band performed at the Blue Balls Festival in Lucerne, Switzerland, on 25 July supporting Airbourne, before returning to the UK for the Steelhouse Festival in Wales on 28 July to perform in support of Thin Lizzy, Living Colour and Uriah Heep among others.

Jaye left both The Amorettes and Tequila Mockingbyrd on 11 September.
She was replaced on a temporary basis in both bands by Mart Trail, who is also bass guitarist for Aaron Buchanan & The Cult Classics.
His first performance with both The Amorettes and Tequila Mockingbyrd came at the same event, Rocking by the River 2 in Saltash, on 5 October.
The band played their final show as Tequila Mockingbyrd on 16 November, in support of Massive Wagons in Sheffield.
The last Amorettes show of the year was at the WinterStorm Festival in Troon, on 30 November, supporting Last in Line and Uli Jon Roth, among others.

The only recorded material to be released in 2019 was under the Tequila Mockingbyrd name, a single titled "Drunk When I Told Ya", featuring O'Toole, Montgomery, Buchanan and Jaye, with Jimi Hocking of The Screaming Jets on mandolin.
On 25 February 2019, Montgomery announced via The Amorettes' Facebook page that bassist Heather McKay and drummer Hannah McKay had amicably parted company with the band. In June, Hannah McKay joined Scottish hard rock band She Burns Red. She left in July 2020, having recorded the "Take Back Tomorrow" EP with them.
On 7 March, a new quartet lineup of the band was announced, as Montgomery joined forces with the rhythm section of UK-based rock trio Tequila Mockingbyrd, who had recently parted company with their guitarist/vocalist. The remaining members of both bands combined in order to fulfil all their touring commitments. Drummer Josie O'Toole and Australian bass guitarist Jacinta Jaye joined Montgomery in The Amorettes, alongside Laurie Buchanan from Aaron Buchanan & The Cult Classics as rhythm guitarist. The same four musicians were also to perform throughout 2019 at Tequila Mockingbyrd shows, with Montgomery on vocals and guitar. Buchanan played bass guitar for the first few Amorettes shows while Jaye was away in Australia.
The first show for the new line-up of Montgomery, O'Toole and Buchanan was in the Netherlands on 20 April, as the band returned to the Dijkrock Festival. The same trio performed in support of Terrorvision at four shows across England from 2–5 May. The first Amorettes show as a quartet, with Jaye joining on bass guitar and Buchanan switching to rhythm guitar, was at the Osteguna Rock Festival in Vitoria-Gasteiz, Spain on 20 June. The band performed at the Blue Balls Festival in Lucerne, Switzerland, on 25 July supporting Airbourne, before returning to the UK for the Steelhouse Festival in Wales on 28 July to perform in support of Thin Lizzy, Living Colour and Uriah Heep among others.
Jaye left both The Amorettes and Tequila Mockingbyrd on 11 September. She was replaced on a temporary basis in both bands by Mart Trail, who is also bass guitarist for Aaron Buchanan & The Cult Classics. His first performance with both The Amorettes and Tequila Mockingbyrd came at the same event, Rocking by the River 2 in Saltash, on 5 October. The band played their final show as Tequila Mockingbyrd on 16 November, in support of Massive Wagons in Sheffield. The last Amorettes show of the year was at the WinterStorm Festival in Troon, on 30 November, supporting Last in Line and Uli Jon Roth, among others.
The only recorded material to be released in 2019 was under the Tequila Mockingbyrd name, a single titled "Drunk When I Told Ya", featuring O'Toole, Montgomery, Buchanan and Jaye, with Jimi Hocking of The Screaming Jets on mandolin.
The Amorettes