I'd just see if you could get a fixed time slot for awhile; tell T you feel the need to see her more often and the problem that when you see her less often, calling for an appointment puts you at the same level as a new client and you'd appreciate more consistency right now. But I think you'd have to agree to see her at least weekly; I don't think she can afford less often because then she'd have the burden of getting another client for the "other" in every other week.