Girlfriends frame is a bit cramped for her, so looking for something around 15"-17" frame size. Doesn't need to be anything women specific, she has a fairly long upper body for a girl.
Only requirements are that it has disc tabs and a short enough headtube for a 190mm fork steerer. More under a £100 the better, but love a good deal, so what have you got?
Finally, if it is of any interest to you, will be getting rid of her 14" Trek 4300 WSD frame and forks once the parts are swapped over.