FUCK YES, SHE'S DEAD!
After several retries I finally managed it... I had to stab the damn X button with one finger whilst holding the controller in the other hand, it fucking hurt my bastard index finger but I got her to change! That's some horrible coding right there, fuck sake I hate QTE!
I've saved at the town hall now but I'm going to go back and try again because I ended up using all my health apart from a serum...