It sounds like NRE to me. She has a new toy to play with so the old toy sits on the shelf; loved but put aside for awhile. I wouldn't sweat it too much. It will pass. NRE makes a person think that rainbows shine out of the ass of the one they are in love with until such time as they start getting annoyed that they leave their socks on the living room floor just like you do...
Keep breathing, try and laugh it off and spend that lack of sexy time masturbating more... be your best primary and take care of you so that when she comes home you are on your game and the amazing person she loves.
I was in the same situation that she is in now about three years ago. The above comes from experience. It was what got us through, maybe it will you too.
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