Is my little sister possessed?

im 17 my little sis is 11, so ok my mom is at work, my little sister who just came back from her aunts house its the end of the summer and shes home now, so she goes take a shower then goes to sleep, she is now sound asleep..me nd my girlfriend are watching t.v in the living room nd we here something coming from her room nd were like wasnt she just sleeping, but it wasnt any noise it was like she was talking to somebody, so we went in the room nd shes laying down sleep but her eyes are wide open were calling her name nd shes not answering shes still talking sayin" i had fun in newyork with my cousin destiney nd we went to park" it was kinda a slow deep voice. we was trynna move her nd tap her but she ddnt move then she slowly turned her head to the closet door nd said "rite daddy" ...my girlfriend waas shaking because our dad is dead he died 3 years ago.. we we so scared then she shut her eyes, we told my mom nd my sister nd sheslike" not uh i said tht??" she was even scared at the fact she did tht... so wht do u think was wrong with her?? she does not sleep walk or talk in her sleep, this has never happen before, is she possesed?? thnks.