You can’t control everything bro, that’s fax. The people saying low interest or you’re too emotionally invested or replying to quickly—these are all just excuses because in reality they’re just as puzzled as we are. Best reason I could think of is she was trying to figure you out, and and some point (possibly after the BJ) thought/realized “ohhh, so he’s one of those....” i.e. fuckboy/dude who isn’t into serious relationships and is more about sex and fun. That’s probably why she was asking all those questions about you and if you were dating anyone. Female monkey brain felt like you’re a non-desperate alpha, hence the sexual escalation, but her being a 9 (supposedly) means she’s at the top of the social ladder, and THAT means she inherently know how guys/people are to a greater extent than most women and is able to emotionally detach herself and override her interest towards you (whereas other lower-tier women wouldn’t be able to).
She disqualified herself if anything. Female hamstering and all that (I find this whole thing dumb tbh because if you pass these shit tests—which is essentially what they are—you are too alpha and are considered a fuckboy. But if you fail them, you’re a desperate beta like all the other guys she’s gotten with).
It’s also possible she suddenly felt the exact opposite while away from you for whatever reason and thought to herself “wtf am I doing with this guy” lol but I personally find this to be unlikely as they usually wouldn’t give you a second date, much less get sexual with you. Plus, you said you were compatible with her; women who deem you to be well below them don’t make themselves compatible for you even if you otherwise would be.
I personally don’t care too much about ‘rules’ with dating anymore (or the game in general really) but I’d still avoid hitting her up today since it’s a Monday, unless it’s later on in the evening/at night.
Keep in mind, all this is just conjecture. We can only know so much about the situation based on the limited information we have, so it could be that she actually just got busy and this is just a harmless blip. In any case, you’ll find out sooner or later. And if you don’t, you’ll either move on or keep banging. Nbd either way.