Quick Question (Advice):
TLDR: Party goes to lavender's and through misadventure ends using charm person to make Vendra hand over a sample of her linament after starting a combat.
So they lay one of their badges on the bar (they had since been dismissed from the guard since Cressida claimed she could no longer pay them but still chose to use them as diplomacy leverage) and demanded to be able to compensate her and take one of the vials. Vendra starts trying to fast talk them out of it.
At this time the ninja chooses to use his ki to try and go invisible unnoticed. So he rolls a stealth check. Vendra notices and sensing shenanigans orders her guards to attack.
On the first round with her first action she tries to charm the swashbuckler, which fails.
Then the wizard casts charm person on Vendra and tells her to have her guards stand down.
The guards, being weak willed dummies who don't really understand magic, protest briefly but do as they are told. The party leaves with one of the vials.
So at this point Vendra knows that my party has the vial and they got it through charm person. Would that effectively wrap things up as I can only assume that she would immediately close shop and skip town?
Or would she hold out due to her own greed?
Why would Vendra run? She is a clever business woman, who has perfect deniability. She's selling one of her older ointments which suddenly seemed to be a cure for the disease. Of course, she knows it does not work, but she doesn't have to admit that. She might indeed have sold an ointment to a client who got better (just by making his saves) and thus been fooled into thinking that her linament had something to do with that person getting healthy again. So she can pretend she actually believes her ointment is a cure.
Even if it is proven that her ointment does not make people better, she can still claim that it might have had a placebo effect on some of her clients, and if not, she was still doing more than the governemnt combined, because she was giving the people something they desperately needed: hope!
So, no, she should not run, but stand her ground as a business woman. The worst that can happen is that she has to admit that her cure does not work, although she was convinced it did. There is not really anything illegal about that. And since there is no way to prove that she knew she was lying ...