This is a great topic!
I do agree, my electrologist has also become a friend and therapist and we usually engage in all kind of girl talk during our sessions.
She has had a few transgender patients in the past and she had mentioned similar things than your electrologist
@Jessica. That many of us tend to "overdo" our presentation. I explained the same way you did by telling her that at the beginning we have to show as many cues as possible to ensure we are seen as women.
She has said multiple times that some of her other patients have commented about me being there and that all of them have seen me as the woman I am, not a single one had any idea. Well... one maybe: The lady who walked in on us during bottom hair removal

Besides that? We talk about family, her business, my work, her former boyfriends and her suitors. Of course, we talk about cute men and we share similar views on politics. And my upcoming surgery - she fears I may regret it and predicts I will develop an interest in men: both of which I did deny.
Se is a very direct person and sometimes has no filter. But this is very helpful, so if I am ever dressed out of line, I will know.
As I said, she has become a friend and I really enjoy our (affirming) girl talk...