The thing about emailing you late at night is concerning IMO. Why should a T be emailing their client at all, unless it is specifically agreed for support in a particular circumstance? Let alone late at night and then not remembering what she said.
Whether or not it's due to addiction or an illness, I think it's quite a concerning thing in therapy. I think clients need to be able to have a level of trust in their T and not have to worry about erratic behaviour. Maybe it's worth raising with her. I think if it was me I would try to find another T.