OK.. so i have just done the bit where she asks to meet you at the waterfall & then ambushes you, but where the hell are you supposed to find her after that.. i have now been looking for over 24hrs, is this a glitch..?
Something else i have noticed, is that some quests will give you an arrow indicating the general direction whilst others have nothing at all, leading to lots & lots of aimless running around.. is this deliberate (if so why?) or a glitch or game design flaw?

Thanks.

I think she runs up to the hospital ruins :>.

Yea, she's there above ground, hiding between the broken walls. You will most likely only find her "naturally" if you do the hospital quest at the same time....which is unfortunate, since there's no other way to know where she is.....

i just chased her when she ran, then went back to kill the others.

Video of where she is: http://www.youtube.com/watch?v=sPHlLeEv5PA

Thanks for the info, I was wondering where she went, after I was ambush by scoitel unfortunately I did the hospital side quest before so there was no way I would have known where she went. I even went to ask Cedric thinking he might know where she is, but he didn't even had a dialog option.

In the video Geralt is using cat potion. Very smart.