Cat with a hurt leg, what can i do for her at home?

So sorry you have a poorly cat and really sad that none of the people you have tried can help, have you tried the Blue Cross they are usually great. If you still want to try some home first aid you can try giving her a little aspirin (maybe just a quarter of one). I have given our dogs aspirin in the past to no bad effect. It doesn't sound like a break, you should be able to tell, she's maybe just pulled a muscle and that will just take time to heal. Try and keep her as quiet as possible, if she'll stay in the house with you (using a cat litter tray) that would be best. And if money is tight make up a litter tray and use ordinary garden soil. I'm so sorry for your troubles, I do hope she gets better soon, wish you could give us all some feedback. Thinking of you. (PS I don't think it is an offence not to take her to the vets by the way, motorists who kill cats on the road don't have any obligation to report it, they do if it's a dog - so ignore that person)