my friend mary and i have been cool for awhile now. i tell her just about everything. she got in a relationship and we kind of started hanging out less and what not. about a month ago we were suppose to go to a concert together that we each bought our own ticket. the day before the concert she told me she couldn't go bc her parents didn't allow her to do anything that night. which i thought was a bit odd. i found someone else to go with and that was that. after the concert i looked on snapchat she was with her boyfriend. i just let it go and said whatever bc i had a good time regardless. now a month later she is asking for the money for her ticket that i used to go with else. i told her no bc she chose not to go and it's not my problem anymore. she got angry and started to become petty. she texted my mom and told her i was smoking weed, doing xans & i am refusing to give her money. then had the audacity to text my ex boyfriend and tell him that i cheated on him twice while we were dating. both are complete lies. i had sex with someone else two months after we broke up. and i've never done drugs besides a few years ago when i was just starting high school. i've never done anything to this girl and for her to stoop so low is beyond me. i don't want to give her the money even more now but i just want her to leave me alone. she even threatened to get the cops involved. that this is considered "criminal activity" i really don't understand how fake she could turn over $100. what should i do? she's trying to really ruin my life and i don't get it.