Advice on a childhood enemy?

I'm a Sr. in highschool, but currently enrolled in a community college taking two classes there.

Way back in 4th grade, I started going to a new school (I had been homeschooled the year before, and went to a different school in a different state before that). A girl in my class was extremely mean to me. She bullied me, harassed me, made fun of me in front of others, etc. so much that I had to be pulled out of that school before Thanksgiving.

Now, she's a student in my College Alg. class. I know she knows who I am, but all of a sudden she's being very nice to me and wants to study with me. (I'm doing fairly well in the class, and I'm not so sure she is). Now, she missed class all last week (and wants to skip tomorrow, too) and asked me to take notes for her. I agreed and emailed her the homework assignment and the notes I took. I wanted it all to end there. But she has other plans...

She keeps asking me if we can get together to to look over notes and help each other with homework.

I've seen/heard her continue to be very rude towards others, in front of others.

I'm very hesitant for two reason: 1) She was beyond mean to me back then, and I don't know what she as the power to do to me now. 2) I don't want to keep working my butt off and have her basically steal my notes, etc.

Any advice on how to handle the situation? She keeps texting me!