Please help me, I don't understand whats wrong with her.

Me and my gf have been dating for ever 2 years now. One thing i loved about her is that she wouldn't leave me alone. I mean she would call often and come over a lot. I know that the gas prices have stoped her from comming down as much, she lives an hour away. Anyways she would also kiss me and hug me and hang all over me when i whent to her house. But now she dosent. She had her gall bladder removed about 5 months ago. Ever since than she hasnt been vary affectionate, she says that she just hasnt been in a affectionate mood lately. Her mom said it might be her horomones and stuff acting up because of the surgery. We have talked but she says everything is ok and she still loves me. But I dont know if i should dump her or try to ride it out or what. She has had a lot going on the past few months and i know she is busy or tired most of the time. Am I being insecure about her feelings for me and not being understanding of her condition or do you think it is something more???