What do I do if a girl want stops talking to me just out of the blue?

My friend Sarah stop talking to me while I went on a trip to kerry for 7 days. I don't know why and she won't give me a reason. I feel like I have done something to her but I don't know what. We used to chat every day at work and outside of it. She used to always come over to me at work to and I'd go over to her. We'd hang out a lot and she'd ask me to go places with her. We even matched on tinder. When I went to Kerry it all stopped and I don't know why. It's been bugging me for weeks almost to anger out of frustration. None it directed towards her. I asked her once why she stopped talking to me and all I got back was "I'm not not talking to you lol". I replied by saying it feels that way. The sad thing is I've lost a friend more than someone I'd love to date and that hurts more. I really can't get this off my mind and I just wanna go back to the way it was. I gave her a hug before I went to kerry, best hug ever but I feel like that hug jinxed our me. Should I ask her again or is it a friendship lost? I've never felt like this before. I was crazy about her. I still am.
What do I do if a girl want stops talking to me just out of the blue?
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