I’m sorry you are experiencing this.
It sounds very similar to my 15 YO step daughter - some examples in our case (mother doesn’t think anything is wrong):
Withdrawn. Spends hardly any time with us as a family. Either in her room or watching a video on her phone with headphones in. No interaction with us whatsoever.
Won’t join in anything. She was coerced out to go for a walk recently and it was such a miserable hour for everyone as we put up with her mood, long face and not speaking to anyone.
Doesn’t join in any conversations, has absolutely nothing to say. It’s painful at dinner time as she sits in silence. Won’t join in at all. It’s the same with extended family, friends and neighbours. Just stands there starring at the floor.
As your daughter, can’t articulate anything and is unconfident when she speaks. Won’t look anyone in the eye while speaking, stirs at the ground. Has no options on anything.
Has no enthusiasm for anything. Has given up all the sports she used to do (couldn’t explain why she wanted to give up).
Has limited friends (who she never sees or speaks to). Won’t go out and meet anyone. Happier hanging round with much younger children.
Doesn’t want to do anything. Doesn’t want to learn to cook, doesn’t want pocket money, has no interest in being independent, doesn’t want to learn any life skills.
Shows no affection. Her dad tells her he loves her and attempts to hug her. It’s painful to watch - she almost freezes and doesn’t show any love or affection. I’ve never heard her say she loves anyone. Can’t even hug her grandparents.
Is quite rude at times - shows no empathy to anyone and can be quite cruel at times. She has no idea how her words can affect people.
Isn’t a high achiever in school. Has no get up & go, no dreams or goals.
Does no exercise. Won’t leave the house unless cohered.
Won’t shower unless asked numerous times. Has to be reminded to brush her teeth. Has really bad acne. Won’t accept any help, won’t wash her face, doesn’t seem interested in doing anything that might help.
In our case, her mother won’t acknowledge anything is wrong (apparently it’s only a problem here). My OH has tried talking to her - she just cries. He’s at the end of his tether. He’s reached out to social services to ask for help - who aren’t really interested in helping, but did interview her and have recommended school councilling.
Its a start but I don’t think she’ll get any help. Until she recognises there is a problem I’m not sure how much this will help, but it’s a start.
Can you reach out to the school?