I would have put in a complaint about her; sure, she may have been having a bad day, but we all have bad days and most of us wouldn't act the way she did with you.
I love the girls at my MAC counters, they're all really friendly and always offer to help, except one woman (who no longer works there funnily enough) - she was always abrupt whenever she served me, snatching my money off me, throwing my purchases in the carrier bag, huffing and puffing all the time. Maybe she was fired, who knows?