Wow, that sounds absolutely terrible! You should mention something about it the next time you see the regular employees, because as a valued customer, it's unfair that you should be treated so poorly. Unfortunately, many of the perfume-counter ladies I've met just have a general... haughty quality, though I can't say I've ever been in your situation =/ But many of them are very helpful and kind as well, so perhaps it's better to ally yourself with those people?
Anyways, perhaps the woman was simply having a bad day - perhaps she had past experiences with shoplifting? At any rate, she shouldn't take it out on you, but I hope her attitude improves if you have another encounter with her. It was really mature of you to confront her about it and attempt to sooth the situation, but some people just don't seem to be very willing to cooperate.
Hopefully, it doesn't happen again, but definitely bring it up to somebody else at the store if it does. Sorry you had such a bad experience!