Sex is becoming less interesting with my girlfriend, why?

My girlfriend and I been together for a year and a half, sex has been always great and super awesome! She has been stressed out over the passed couple months since it was the end of the school year (she is a teacher) and we she's been planning on moving in with me. Sex hasn't been the greatest the past two months and since she moved her (a week ago). We love each other dearly, she easily gets stressed out about anything (she is applying for other jobs but she has a great one already). I don't what to do :( tho. We have couple toys and have enough things in the bedroom to make sex more fun, however, she hasn't been in the mood for awhile and that worries me. It's our summer beak now and it's the only time of the year that we have for each other. What should I do?

Sex is becoming less interesting with my girlfriend, why?
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