Stupid post

There’s this girl on Facebook who I think is legit because her photos don’t look like filtered or anything and at one time I clicked on her page and looked through it and there were a lot of posts like from a long time ago and pictures of her and stuff like that, but I don’t know anyway she friended me and I have no idea who she is and every time I post a photo of myself she hearts it and she sent me a message saying hey and I never responded, but I feel very awkward about it lol idk why