Sorry to hear that. When i did it i had her at her base form so l wasnt aware it reset anything. On another note, I just used up all my items for one type of transformation, let the cops arrest me (thought that would give me an actual ending....nope) and it put me back at my previous save with all my items I used and current mutation level I ended at. Also will revert back to base form if you quit, but atleast you can see all forms.