I was in the same position. Everyone else could get away with leaving early or taking longer lunches yet I was criticized for everything.

Apparently they were angry because I took time off.

I really feel for you. Its hard to know what to do. When I left I was told that I need to get along with people. Not sure how to when you are abused for taking time off after an injury... and all the rest I got.

Can you negotiate shorter days? Is there someone in your workplace that helps with injuries?

Honestly, just ignore her as much as possible. Do your work to the best of your ability and what happens will happen. I know its hard. but if you can keep doing your work she won't have much of a case. If she goes to the boss all you can do is show that you have been working.