She does not respond to texts What is up with this girl I'm trying to woo?

this girl bella I've known for a couple months, she goes to UCLA and I go to Washington State, but we both live in San Diego. Whenever I come home, I always ask her to hang out and she will 90% of the time come to chill with me whether it be alone or drink with my friends or hers. But sometimes, I go back to my uni. I text her and she don't respond. I mean they are not usually questions but statement but it very annoying. I just wonder why she is always willing to meet and hang out with me whenever I ask her but she is not respond to text