Be kind to the girl, and don't avoid her just for this. But if she becomes what such rumors say she is, be weary. Remember that your mother only wants what's best for you and, while it is your life, that doesn't mean you should ignore her completely. (There is a distinct difference between caring and just wanting power over someone's life, after all. And in the teen years especially that line can seem to evaporate from one's perspective. Such is part of why many rebel agianst their elders in this culture.) Take her advice but also mind your own. Try not to be judgemental, but be aware of danger or roads that may lead to it.