Snorting Xanax the first time at school?

My friend Erica is going to snort xanax during lunch at school, i tried to convince her not too but she wont listen, itll be her first time, i wanna get the facts so i can tell her. First, what will it do to her?, how long will it be?, she will be snorting a small line of xanax she told me, and shes gunna skip cl after that, im worried bout her, someone please give me this info now, thank you!