What do I do?

For context my friend and I both go to college but hers is a couple hours away. She's communicated with me how she appreciates how I still stick by her when she leaves me on delivered for hours. She's a busy person which I 100% understand and don't expect her to answer. I've been bullied before and had terrible best friends therefore this relationship I have with her is thee best I've had so far. However recently she doesn't seem that interested in what I text her (she lives over there and comes during the weekends to her parents house) no she's not taking classes rn but something specific that I won't state lol, not serious just not trying to give myself away. Anyways when she is busy she usually replies by the end of the day. Recently though she hasn't messaged me in two days and I'm kind of down in the dumps because I really cherish her. Sometimes I feel like I cherish her more than she does to me lol. UGHHHH what do I do?