She may have maturing issues or something close to that like a disorder, try to understand her better. Maybe ask her, nicely though and don't just bring it up all of a sudden.. Slowly bring it up. Its not really normal for this to happen to a 14 yr old but there may have been something that happened in her early developing yrs that caused this
My friend acts like a child. She's 14 and whines and cries when she doesnt get her way or take her blanket. She very stubborn. Is everything normal?
Maybe she has issues, maybe autism or something like that. Contact a doctor.
Well it sounds like she's got some kind of personality disorder if she still has to rely on a security blanket aged 14.