Why does she behave like this with me?

There this girl in a class I take in college. She doesn't have a conversation with me, but she always asks me "do you understand the class?" at random points at the class, she makes sure I have what I need to complete a task without me even telling her I need something, in one occasion, I was telling a classmate of mine (we were in front of her) that I wasn't sure if I was going to pass a class I have, she said "don't say that, you'll pass".


What's strange is that, after those interactions, she ignores me completely until the next class.


I know she is not into me and I'm not upset about it but I just want to know why does she do this. I'm just curious.


Thank you for your answers.

Why does she behave like this with me?
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