I'm sorry for this. Even if you've done something wrong (but it really doesn't sound like, judging by your post), she has no right to be mad at you without giving a clear explaining. But.. was it just this call, or she's like that even during therapy too? Because if it just was on phone, maybe it was only a bad moment not related to you.

All I can suggest is to confront her at March about what you're feeling.