Is my girlfriend avoiding me.?

Just going by what you've observed, I'd really have to wonder if she is even really at this "camp". Phones can act up, but there sounds to be a distance between you and her, that she is communicating with her silence and excuses. I know you don't want to mistrust her or jump to any conclusions either. All may be innocent but in all honesty I doubt it. I go through periods of ups and downs with my love, sometimes want them around, sometimes need my space. I still am in love, but my personality is not clingy and I am pretty independant. Maybe she just needs space? My other half often misinterprets my solo act as a sign I don't care or I have lost my feelings but it's not so. I have always been in need of solitude here and there, and really can't function without it. I hope you will just give her some time, but stay observant to her behavior...especially when she gets back home. Good Luck!