I can see the woman I see offering (if not offering to me, offering to other clients. Not me because I am sort of not keen on others being around during difficult things. I don't mean she would just come up with not me out of the blue, but rather as respecting me) or being willing to consider such an option if asked. If it sounds useful to you, why not take her up on it = I would try to clarify payment, general expectations, exactly what the therapist's role will be etc beforehand so as to not have those concerns add to the concerns of the actual procedure.