Well, the truth is, dawg, she just wasn't interested in you; it happens.
Yeah, she gave you her number, but after initially talking and texting with you for that brief moment, she made her decision to ghost. It doesn't have to be because of another guy over you, but rather, she just wasn't feeling the energy between herself and you.
It could also be how you texted her in response to her making it home safe, considering if you responded to that 1:30 am message. If you didn't that could've been why she ghosted you, felt like you didn't make her a priority.
See dawgs, sometimes you gotta play the long game to win a woman over in terms of gaining her attention. Yeah, I know it might feel like a waste or that the end game doesn't pan out the way you want it to be but showing energy can make the difference in whether she takes you seriously or not.