I sense some hostility here.....
I think the official story at the time was that she was too upset to continue after the loss of Flt Lts Egging and Cunningham (I think she was still in the team for Flt Lt C's horrible accident).
Subsequently, of course, there were other reasons? Frankly I would think that her position would be untenable in a situation where she was having a relationship with another pilot on the team?
Presumably this was deemed the best outcome for all concerned.