I think she handled the situation in the wrong way. It was unprofessional to leave you hanging in the wind by abruptly cutting off therapy with nothing but an email...not even a referral and without telling you why. If you have been seeing her for any length of time, she would have known how dangerous and detrimental this could be to your mental health if you were in a bad place. I guess she assessed the situation and thought you would be ok.
I think she reacted in a personal manner to a professional matter and didn't handle it well. I'm glad she at least allowed you closure. I know how it feels to an extent. I was 'dismissed' by a shoddy psychiatrist years ago. It's not a good feeling. I hope your trust hasn't been so shattered that you refuse to try therapy with a more professional therapist. Good luck and best wishes.