not even sure how to react

My friends just showed me this girl who stole one of my ultra sounds on social media... she goes to my school and apparently has been Facebook stalking me. She posted one of my ultra sounds on her Facebook and crossed out the names she is now saying they are hers.. 
I don't know how to react to be honest. People know she's lying because she's only 7 weeks pregnant and I'm 7months so there's obviously no doubt they arnt here's but I don't know how to deal with this.., any advice? Should I confront her? Idk anymore. Some people 😒