My girlfriend is acting weird ( question)?

me and my girl have been together 10 months everything is good for the most part a few small arguments hear and there anyways she goes to school and works almost everyday so she gets tired really easily and normally goes to bed when she gets home (we live together). we just started living together and we used to have before pretty much everytime she came over which was 2-3 times a week but now that we live together im lucky if its once a week and she lives at my house for free it drives me crazy now i know its not cheating or anything because she comes home straight after school or work and she normally just wants to sleep i dont know what the deal is but it kinda worried me today i kissed her a few times she told me that i was too "lovey-dovey" and also that she doesnt like kissing that much which i dont understand at all because when we first started dating she would never stop kissing me and i didnt like kissing that much i dont understand what this girl wants at all can someone pleas help