Sister and I growing apart...?

my sister is 14 and i am 12. recently she got a laptop and is ALWAYS ALWAYS ON IT! when she is in the mood shes nice to me alot, but when she is on her laptop shes on facebook all the time and now i have to knock when i come in and she usually shuts off what shes doing. we used to be really really close, we still are sometimes to. but now shes really interested in boys and i am a little but she is WAYYY more then me. i feel like shes growing up and i still like to do the things we did when we were little and she doesnt. will this blow over soon? and i dont really want to talk to her about it. so is it permanent or is just teen phase for 14 yearolds. will it go on for a nother few months or years? thanks