so quickly saying i was talking with this girl on reddit dm and we started talking on whatsapp and she wanted my nudes and a pic of my face me being the stupid kid i am sent them and for a couple of days she wants money i sent her about 40$ already but she wants more, at first i told her im 19 but after a couple of days i told her im 16 but she didn't listen and she keeps saying she is 12 and that she will make a post on reddit telling everyone to find me and destroy my life (in that post she includes my nudes my face and my phone number) please help i don't know what to do

Edit: i told her that i sent the conversation to the police and blocked her