Does she just use me as a study buddy?

She and I are in the same math class in college. I've always been good at math ever since I was little, so I've been helping her with her homework and discussion problems. She seems to like me in person and being quite talkative. However, when I text her, she only replies once a day. When I asked her about it, she claimed being super busy with school, homework and etc.

I'm quoting her texts here, "No I find it interesting to talk to you and learn about the things that interest you but I just would rather keep our conversations in person!"

I mean I do know that she studies a lot, but couldn't she just take a break once in a while to text me back? I can confirm that she's studying a lot because I can always find her studying at the library. I'm busy too, but I can always find time to text her. Maybe, she doesn't like me enough? What's going on? Is she just bad at texting? I need someone to enlighten me on this situation. Does she only think of me as a study buddy and not a romantic interest? Yes, I do view her as a friend and also a romantic interest.