I'm sorry to hear that your friend isn't supporting you as she hoped you would, because you are right; anxiety doesn't care who you are! You have every right to feel the way you do, too.
Feel free to chat in this thread and provide more detail if you like, but based off what you have said so far I'd gently suggest being super direct with her. Sit her down and being assertive about what is going on for you and how her reaction makes you feel. Give her a few actionable things she can do to help you.
Do you have any other support network that maybe she can also talk too to get a better idea about your experience with anxiety and how to be there for you? It may help drive it home if she hears it from someone you both know.
Keep us posted if you like,