It’s not my fault

My “friend” made a post on Snapchat about how her phone was slowly dying on her (battery jumped from 100% to 70%) and she needs a new one somewhere. I’m the one who sold her that phone a month ago, and she’s obviously targeting those snaps towards me hoping to get some sort of refund ($115 refund). Sorry, but I had no issue with it. I had that thing for 2 years, and not once had I ever come across a problem with it. Also, why can’t you just BUY a new phone? She has A JOB. I know damn well she doesn’t do anything but spend money on overly priced tattoos and clothes (can’t begin to explain that one). You’re 19, grow the hell up and stop buying used things/wanting something back after you regret it.