[1] She was one of the founding members of Inghinidhe na hÉireann, being appointed its executive secretary by Maud Gonne, the society's president.
Quinn represented the National Women's Committee at the Franco-Irish celebrations held in Paris in 1900 with Jennie Wyse Power.
[6] She began acting with the Inghinidhe's work of promoting Irish drama and literature, performing in An tobar draoidheachta (The magic well), which was produced in 1900 with the Ormond Dramatic Company and William Fay.
Milligan also helped in the first Dublin performance of Eilis agus an bhean deirce (Eilish and the beggarwoman) by Peadar Toner Mac Fhionnlaoich.
Quinn played the title role opposite her future husband Dudley Digges in a double bill produced in collaboration with the newly formed Irish National Dramatic Company featuring the first public performance of George Russell's Deirdre at St Theresa's Hall, Clarendon Street.
At St Mary's Minor Hall, Belfast she played the leading roles in Cathleen Ní Houlihan, and The racing lug by James Cousins.
[3] Members of the Inghinidhe broadly tried to avoid altercations with the police, but in one flag-burning incident, Gonne and Quinn almost were imprisoned for a night.
[6] On 8 October 1903, she, MacBride, and Digges walked out in protest at the opening night of In the shadow of the glen by John Millington Synge[8] in response to the portrayal of the heroine who rejects both her mercenary lover and unloving husband.