Bestfriend help!! shes changing 10 POINTS!?

I have a really close bestfriend. She moved last september for her dads works she visits a lot and is moving back in october. She's visiting now and last time i hung out with her she was really rude and different. She's been acting like this on the computer but i thought it was just cause we were on the computer. But no she's changed. Also she hangs out with the wrong crowd. I told her last night she changed and she argued with me. Her family and i are close her g-mas like me and her uncles and mom and dad. But her mom said i had problems. I just wanna be friends abut then again i dont. Please tellme what to do!!