I think the group therapist is stepping outside of her scope of practice. It is your pdoc's job to do medication management, not a group therapist's responsibility. The group T doesn't have training in this area. Is the group T worried the meds are expired and therefore no good? Or that you will take too many pills at once? If the latter, and if you already have 2 months at once from the latest prescription, it seems that having a bit extra from the month before really doesn't matter, does it? Why wouldn't she be worried about having 2 months at one time instead of 2 months + some extra? Doesn't make sense. Maybe just reassure the group T that your postdoc is on top of this and can handle medication concerns and if needed, the pdoc could hold extra meds at his/her office for you. If the group T persists, can you find a new group?