If she can't handle you then she can't handle you which would make her a bad therapist for you. She may have been pondering this for some time but not wanting to freak you out by saying so--maybe she thought she could get past the problems she was having, but couldn't

That sound like I'm defending her, but I'm not. Presumably she took on the job alert to what it would entail as any good therapist would. My therapist promised he wouldn't leave me (if he could help it--he ended up retiring after a long time) and he said that was part of the patient-therapist bond: that the patient be the one to decide. Telling you in an email was just cold.