its best to pack em so that if she does not have any and tries to scam you you can say "But wait! I have these!" then she has to go into some lame excuse about either being alergic to them etc...
pack a 3 pack of latex, non latex etc.. always have a stash bag.. just before you go in grab 1 of each.. this way you are assured of one being cool with her and 1 pop.. if she gives you a problems about the buffet and don't have any.. try to find this out before you pay,
But like trade out there... there are certain tools that the craft-person has to provide....