As far as I know, Xanax isn't used for long-term treatment. Because after a while, tolerance develops, and you have to increase the dosage. As a result, you can become addicted to alprazolam. So if she doesn't stop using it after a certain period, she should ask for help ... Also, I found on addiction resource.com that Xanax can cause impulsive or aggressive behavior. I think that's why she can sometimes be rude to you.