I know it is definitely possible. I started having episodes when I was less than ten years old (I am 32 now). If it runs in the family her chances are even greater. I would take her to see a therapist.
Family doctor is first step and ask for a referral to a psychiatrist. To my knowledge it runs in families, you need to catch it early and you will save yourself a world of heartache will horrible behavior and possible drug and alcohol abuse and even a risk of suicide if you catch it now. Please do not wait. And remember I am an experienced patient who cannot give medical information. I can only give information from my life experiences.
Yes it is possible expecially if it runs in the family the first syep is to talk to s doctor, but it could be that her body is changing and is going through puperty