12 year old girl struggling

[Nogodsnomasters]

Hi, I don't even know where to start with this. She is my niece and has been raised single handedly by her mother who had her at 16 years old and has struggled but done her best. In primary school it was suggested by her principal that she may have autism, this was never followed up on properly and she's had no formal diagnosis but as she gets older it gets more apparent (I've read girls mask it better than boys).

She struggles to make true friends either being used by peers or not being fussed if anyone speaks to her, she did make one true friend who has now fallen out with her due to her behaviour. She doesn't seem to care about anyone or anything. She gets average grades in school but is always in trouble for fighting. She comes home from school and sleeps a lot, which I think is a sign of depression. She doesn't open up to her mother and isn't close with her father or grandparents. I don't live close enough to have formed a tight bond with her but I love her dearly.

She's acting like a moody 15 year old even though she is only 12. She did go through puberty early though and has been having periods since she was 10.

She has been in trouble with police and school have phoned social services due to certain behaviours in and out of school. She had nearly 2 years of counselling after one of my sisters died from aged 8-10 but since that stopped she has gone downhill. Her mum has no idea what to do and has booked a gp appointment but doesn't know what to ask for, she has also had countless appointments with school but nothing has helped.

Can anyone suggest anything or tell me about similar experiences with a young girl? Thanks.

[Nogodsnomasters]

Anyone? X