Hey guys, first time writing here. I have one situation here and I am curious for your advice.
I've met a girl at uni class, I thought she was cute before out meet we haven't had a chance to meet and I didn't care about meeting new people.
Our first encounter was about three weeks ago at class, she sat beside me but we didn't talk much, had a laugh or two when I tried to see what she wrote since I couldn't see the table. Two weeks after that we were first at class and I started a convo, she seemed aroused and laughed even and the stupidest shit I was saying to her. Took her number, talked a bit during the class, everything went fine. After the class it seemed like she stopped to ask me if I am going to another class. It seemed like she liked me. Same day at night I texted her, but fell asleep during convo since it took about hour and a half for her to replay on first message. In the morning we continued, I asked her if she had any plans for the weekend, which ended in me asking her for a drink on Friday where she said she had to see a friend and she will text me back. That day in class she was strange, didn't even said hello. Didn't text me back for a drink. Week after that, yesterday, I could not attend the class since I had a cold, asked her for photos of what they had written. She send me the photos and was kind. Today at class she said hello with a big smile and that was it. Honestly I don't know what to think.

What I am curious of, have I fucked something up(and if I did how to fix it), or she is playing games, or she just doesn't like me?

Thanks in advance for all answers, enjoying the community so far.