Okk. well today my best friend got a boyfriend and thats all she thinks and talks about...?

we are in 7th grade and she says she is in love with him and they been going out for like a day. she even admits that she is obsessed! so i dont know what to do cuz she think she is in love and i know shes not and all she does is talk to her boyfriend or talk about. she is my best friend and i dont know if shes ready to have a boyfriend but i cant tell her that. what do you think about this and what should i do. and what would you do/