Long distance girlfriend suddenly too busy to text me?

My long term girlfriend is visiting me soon and everything seemed to be going good. We've been dating for a year and things are good. On new years she called me, all was fine, she was with her friends etc etc. The next day she wakes up, and like a snap of a finger, our communication is cut significantly. She would take forever to respond to my texts, answer my questions, and not really expand our conversations (very unlike her) So i think maybe she's having a rough day, out of it, not feeling well? When I confronted her asking if she's okay she said she was really sorry, she was "busy with family", this is understandable, but normally when she is with her family she still finds time to text me. She said she was trying to spend more time with them away from her phone... It's like something bad happened or something. I know she's coming to visit me soon, but what gives? She's being a bit sketchy (not really invested in our texting convos) and not acting like herself. Maybe a sign of cheating?
Long distance girlfriend suddenly too busy to text me?
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