I know, others have probably said all there is to say about this and I too feel very sad for you that this happened and understand your confusion, hurt and frustration. She sounds burnt out, angry and frustrated. And that doesn't help you at all!

I just quickly want to pick up on something... You said she has been seeing you for free for a while now.
In my opinion this is almost ALWAYS a red flag. It's unethical for many reasons. And one of the reasons being the way you feel now and the added feeling you have of you "bleeding her dry"
Not paying for sessions even a very low fee of a few dollars leaves you vulnerable in many many ways. Perhaps she thinks that she has done you a "favor" and you haven't returned it by working harder. It's a wrong thought on her part, but T's are human and this could be what she is feeling.
And it leaves you absolutely powerless because if you were to complain to anyone, the issue of not having paid for the sessions, the email or phone contact in between sessions.. it would make things very complicated...