That kitty has certainly been through a lot,as have you..
I would say,most cats hate taking meds,your kitty is not"Satan",she's been in pain,spent 2 weeks in a hospital and is on meds,enough to get a cat totally stressed out,I know anyone of my cats would be
As for suing the vet,no owner can sue a vet because their cat scratches them while getting medicated,so I don't think the vet worries about that.
You obviously care a lot about your kitty though and I
hoping for the best for both of you