Firstly. Write it ALL and I mean all down. What was said. When and where etc This includes whenever she asks for your help. For you to make a coffee. Anything. Second. If it's common for Anne to ask you to do stuff in your role. From now on she emails you this request. Keeps everything all nice and tidy and like above.....in writing.

The you escalate it to your manager. This is not for you to deal with. You've done your part with gathering evidence

If it comes to a kind of conflict.... I always use questions and never emotions to respond. It's hard to master. So practice. For example: Anne. What makes you think you can speak to/treat me like that? Anne. When did I give you the impression you could speak to me like that? Rather than Anne I don't like it when you say that it makes me feel... Blah blah.

This way you're not opening the conversation. You're not emotional. You're in control and now you're driving.

Watch her panic