Amos was an important influence in making mentoring, instead of hazing, the focus of women's organizations on campus.

In the early 1920s, Dean Thyrsa Amos saw the need for a society for outstanding sophomore women, as the University of Pittsburgh had recently started the Society of Druids for sophomore men.
On 7 November 1922, twelve sophomore women responded to invitations and met at Heinz House, electing to found a society to sponsor activities for all freshmen and sophomore women and to "select for membership in the spring those freshman women who displayed the finest Pitt spirit, showed good scholarship and expressed interest in activities through fine participation in them".
The society was named Cwens, from the word cwēn, meaning "lady" or "queen" in Anglo-Saxon.
The emblem selected was a golden crown resting upon a sceptre.

In 1975, the Title IX Education Amendments mandated the abolishment of single-sex organizations in institutions of higher learning.
In October 1975, Cwens chapter presidents gave authority to the National Executive Board to disband the society and to formulate plans for a national sophomore honor society for both men and women.
The National Board disbanded the National Society of Cwens, founding the Lambda Sigma Society as a direct descendant on 6 March 1976.
Amos was an important influence in making mentoring, instead of hazing, the focus of women's organizations on campus.
In the early 1920s, Dean Thyrsa Amos saw the need for a society for outstanding sophomore women, as the University of Pittsburgh had recently started the Society of Druids for sophomore men. On 7 November 1922, twelve sophomore women responded to invitations and met at Heinz House, electing to found a society to sponsor activities for all freshmen and sophomore women and to "select for membership in the spring those freshman women who displayed the finest Pitt spirit, showed good scholarship and expressed interest in activities through fine participation in them". The society was named Cwens, from the word cwēn, meaning "lady" or "queen" in Anglo-Saxon. The emblem selected was a golden crown resting upon a sceptre.
In 1975, the Title IX Education Amendments mandated the abolishment of single-sex organizations in institutions of higher learning. In October 1975, Cwens chapter presidents gave authority to the National Executive Board to disband the society and to formulate plans for a national sophomore honor society for both men and women. The National Board disbanded the National Society of Cwens, founding the Lambda Sigma Society as a direct descendant on 6 March 1976.
Thyrsa Amos