I fully agree that getting your bun well is the most important thing!
I know its hard. I have 2 buns, plus I’m currently caring for a friends bun. 2 of them seem to hate me right now (lol!) as my female bun got injured and has to get a foot soaking twice a day (ahhhhh shes like a cat in water!) and my friend’s bun was just fixed and wants to hide and sleep all day. My friends little bunny is slowly getting better but its a slow process! My female is…on and off with love/hating me XD. I also had struggles with tummy troubles with my female, and, all during that, she would fight me, hide from me, box at me, anything to stay away from me. Once she got better, it was like a miracle and she was just the cuddliest bunny ever.
Your bun will likely get better once the treatment is over, just give her plenty of space! Spaying will help some too when she is at that age but I think a lot of it for her is just being upset about treatment!