Annoying friend

So I have this friend who I've known for 4 months, she's nice but kind sporadic ? Idk if that'd the word but she messages me every second of every day , even messaging me during class .We've met online , altho we are in the same state we've never met up. She's offered a lot to come over and I've declined, not because I think she might actually be a 40 year old pedo but because the way she acts towards me is strange. We've video called a bit but ive mostly declined calls with her opting for excuses. She sends me a ton of photos of her all relatively normal photos but she's also sent me a lot of videos alluding 2 sex like videos titled "ngl I wanna f*ck you" and stuff like that and normally I'd think it was a joke between friends but it's the only videos she ever sends me, I've never got a non sexual video sent to me ,even when I had a gf and disclosed that many times to her , she'd just say it was a joke and that I'm the weird one for insinuating otherwise, but many times I talked about a slight issue with my (ex) girlfriend she would immediately try and convince me to break up with her and she'd ask me  questions (unironically) asking what I sleep in ,asking about my sexual encounters and sharing her own (in detail) and she'd talk abt her kinks and what she likes and she'd ask me to call her "good girl" often she'd delete the message asking me that immediately after. When I had finally broken things off with my ex she immediately jumped into a sexual conversation which I declined, later I had quoted a movie of having a one night stand with a stranger, mind you we both make sexual jokes all the time and she'd make a sex joke every other message , but when I had quoted the movie she immediately got angry and said "you had sex with someone you didn't even know?" And after I clarified it was a quote she didn't belive me and opted to calling me a slut . I stopped messaging her and came back (on a different social media app) where I had her added and she sent me some videos that I hadn't gotten 2 reading. I liked one of them and she immediately said "ew" and I asked her "wdym ew" and she didn't respond , I changed my note/status thing to a joke and she IMMEDIATELY changed hers 2 "your so cringey wit your notes" . Idk why she acted like this especially since she has a girlfriend , she got so pissed when ever I'd mention any one and this last situation makes me think I should just block her.