My Friend Deleted Me Off Facebook? Help, Please?

[CandySweets]

I'm on summer vacation from college and just noticed one of my friends deleted me off of facebook. We didn't get in a fight (at any time, really) and it is upsetting me. I haven't talked to her since school got out (I've been in Europe for the last two weeks), but my other friends haven't talked to her either, yet she didn't delete them. I asked our mutual friend and she said that Marissa (the girl who deleted me) hasn't said anything to her and they haven't talked since school. The last two weeks of school Marissa was being mean to me a little (telling me to shutup, I'm stupid, and saying to stop talking about my grandmother whom just passed away). I first brushed this off as her being in a bad mood, but I'm really upset she deleted me.

Should I text her, or move on? I appreciate your answers.