Is it normal to hate someone for this?

The thing is, since I changed classes, I was assigned a classmate named Astrid (a redhead with short hair). At first, she was fine, but one day in computer class, we both had to do a very important assignment. We coordinated that day, but after that, she ONLY started skipping class, which started to stress me out since my grade in the course depended on it. I told the teacher, but she told me to just do it alone (sorry, too much text). After all that work, one day (after computer class), she was with her group of friends, Speaking as if nothing had happened, she told them that he missed his computer classes.

I was disappointed when I heard her say that, I mean, I had to cry and stress myself out while everyone supported each other, and I was sinking from fear and anguish. No one around her judged her and I don't even know how she got through the year, now, this year she dropped out and went to another specialty (but we're still in the same class) she's laughing and laughing with her friends while they put on makeup in class, of course, she said she has self-esteem issues with how she looks but that doesn't give her the right to be like that in the middle of class right? I don't know, sometimes I feel that guilty feeling for feeling this way since with any good action she does towards me (yes, it's usually like that) it makes me think that the one who is wrong is me...