The She Trinity was a Canadian/British pop group of the 1960s, an all-girl group who played their instruments, quite unusual at the time. The original members, Robyn Yorke, Shelley Gillespie and Sue Kirby, were Canadians who came to England around 1965. They were joined by Pauline Moran on bass and Marion "Rusty" Hill on keyboards. Eileen Woodman joined in 1967 when Rusty left, by which time Shelley and Sue had already left. The final 1967 line-up consisted of Robyn Yorke and Janet Baily on drums, Pauline Moran on bass guitar, Eileen Woodman on keyboards, Barbara Thompson on saxophone and Beryl Marsden on vocals. The final line-up was Eileen, Robyn, Pauline and a Swedish guitarist named Inger Jonnsson. The band dissolved in 1970/71.

Eileen Woodman went on to play keyboards with Billy Connolly and Gerry Rafferty in the Humblebums, Pete Brown's Flying Tigers (previously The Battered Ornaments) and also did a stint as Keyboard Player/Vocalist with Tinkerbells Fairydust (at that time Known as The Rush). Pauline Moran went on to be an actor on stage and in film and television, including playing the part of Miss Lemon in Agatha Christie's Poirot with David Suchet from 1989 to 2002, and again in 2013. Barbara, who married Jon Hiseman, became a notable jazz-rock player. Beryl Marsden still plays and has appeared in the Beatles Festival in Liverpool.