I would talk with her like the others have said. Psychosynthesis is very holistic and incorporates the body and mind as one, saying that I imagine she does not treat depression and anxiety but she does work with it because they are a part of being human, we can’t separate the two. I believe Depression and anxiety are symptoms and conditions of living in a modern world full of stress and chaos.
I understand your therapy is not conventional but it sounds like you have both worked together well and I don’t think by telling her how hard it really is will change her mind about working with you.