A.S.
Hello S. ,
I have two boys a six year old and a 20 month old.I Personally don't like TV or Phone in Children Bedroom .I have told my boy that his bedroom is to sleep only since he was a todler . They have a separate play room. I Belive is bad for them because the conection with the family is distrcted by going to the bedroom and watch TV . I don't think is that she is becoming obsessive , I think is something beyond that . She probably want more attention and since you mention her biological mother is not in the Picture that has probably dramatize her . I would seek professional Help maybe a child Phsycologist can help , I hope everything work out and keep me posted !!
~ A.