What do you think of the way she acted towards me? ?

Well, last Monday, This girl that was sitting next to me, we sit in the front row (Me in the left and her on the right. I will give a backstory of this, this was two Monday’s ago, she asked me if I wanted to be in her group, it was in the last minute as I was going to be in the other group that was behind me. Literally, I was going to go to the other group, if she didn’t asked tbh. It was like if she planned it because it seemed that way. She is cool tbh, I thought she was mean but she is not. Her friend now, I don’t like that much, I had her for a project next semester. The next Monday, she greeted with excitement, she handshaked me but in an excitement way with emotion when she arrived. Then during the class, she was trying to get my attention by laughing a little and then when the professor would say my name as an example, she would turn to me also I was in my phone writing notes for my assignment in class when she randomly joking put her fingers in my screen and randomly pressed keyword from across. She was trying to get my attention. I could be oblivious but I know she was. She has a boyfriend but I want to why she was doing that? I took it as friendly tbh. She didn’t do that to anybody but me. To make the story interesting, we share the same last name.