>been talking with a girl after one of my classes throughout

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>been talking with a girl after one of my classes throughout the semester
>brought up going to school's art museum this past Tuesday
>got her number yesterday
>saw her in class again today and she seemed to be giving me the eyes
>talked to her after class (she left class before me and was waiting on a bench outside the building and waved at me so we talked)
>invited me to an underground noise concert thing
>went
>her roommate/friend came with her
>I rode the bus there because I don't have my car at uni
>she took her scooter with her roommate
>they decide to leave and ask if I'm going to stay longer
>told them that I was since they didn't seem like they were going to invite me
>girl tells me thanks for meeting her and good luck on my exams
>gives me a side hug (little awkward)
>go to the bathroom and head out
>they still aren't gone
>walk past them without acknowledging them (kinda embarrassed)
>they see me and say bye and I say bye too

What should I do now? I was thinking I'd wait until tomorrow to text her and see if she wants to go to the school's art museum Tuesday afternoon, but texting so soon might seem desperate.

Should I send her a text today? Or would that come across as desperate too?