To be honest, I don't see a therapist as being on "the side" of a client in any circumstances. It is not something I understand as a concept, so the woman not being on my side is not really something that I find upsetting.
The woman has told me other clients view her as being on their side but I don't know why she thought that information (which I am not certain is even true) would be useful for me.

OP - what could the therapist do to make you think she was on your side, if that is something you desire from therapy?