My two year old is secretly a teenager

I'm coming to the conclusion that little girls are definitely different than boys. OK, I know, duh! But, seriously, Lucy has begun to turn into a little teenager. When she gets upset at one of her brothers and starts crying she runs to her room and closes the door. I have no idea where she got this from. Unfortunately, since she is still two she has just recently learned how to open doors. So sometimes when she's done crying and wants to get out she has to jiggle the doorknob a bit before she figures out how to open it or she waits for someone else to open it.