<human>: Can you give me the gist of the text in a nutshell?

Met a girl a few weeks ago through orientation for a graduate program. Exchanged numbers and she implied that we should hang out. I took this and a couple of other signs as interest on her part.

A couple of weeks pass and there's a little back and forth. I ask if she'd like to catch a movie and she agrees to Saturday night. She also implies that there are good restaurants nearby, so we tack on dinner before the movie.

Dinner is very smooth and the conversation is flowing. We have tons on common interests and traits. Things are going great as we head to the theatre and get seated for the movie. Now I picked this movie when we were making plans not expecting her tobe interested in it (I was pleasantly surprised when was willing to give it a shot).

Things seemed different after the movie. There was lots of yawning on both our parts (we're both early risers). Although she hadn't touched her phone openly the entire night, she was now sending quick texts as I drove her back to her car. The conversation just seemed a bit slow at this point. When I got to her car and before I could say a nice goodbye/give her a hug, she said goodbye pretty quickly and hopped out without any significant words about future plans. 

I texted her later that night to make sure she got home safe and received a quick message back also thanking me for inviting her and for dinner.

Now this was more a pre-date than a first date for me, but perhaps I read her wrong. I'd like to ask her out on an "official" date, but I'm getting an un-interested read based on the end of last night. We'll be in the same classes in a few weeks so I also don't want to be over-aggressive in asking her out.

What do you think? Am I reading this wrong? Should I ask her out or wait for some signs from her?
<bot>: Hang out with girl on what might be a date. Goes well at first but the goodbye is quick and abrupt. Should I ask her out again?