[Tom4784]

With people like that, the best thing to do is to ask to speak to her in private and politely and professionally ask her not to treat you like crap. As long as you remain calm and professional then she can't really object and chances are she'll crumble and relent because she probably never expected to be confronted over her behavior. Might be a good idea to record the conversation if you can, if she crosses the line you'll have proof of it.

It isn't in your contract to be treated like a doormat by what sounds like someone who shouldn't be a manager in the first place and it's well within your rights to try to stamp it out.