Perhaps this isn’t universal but I personally found that with my DS (ASD, ADHD, Dyspraxia) things went really downhill in the teenage years but improved significantly once he reached the early 20s. It got really bad between 13-19 but he’s 23 now and has begun to carve his own groove rather than fight against the mainstream funnelling,
Adolescence is difficult for most people but purely from an observational point of view it seems particularly difficult for autistic teenagers, especially those who were successful maskers in childhood who felt bewildered as their peers changed around them.
Changes come so quickly in the teen years it’s not surprising that kids who already struggle with change and recognising social cues develop anxiety as all changes around them (and their own bodies change too). Thankfully the rate of change slows down significantly once they get to 22-23 ish.
Finding a local friend with similar challenges mightt be helpful and good for self esteem building - in an ideal world that could be facilitated via social and support groups for autistic girls but I realise it’s not that simple, especially if a teen is firmly in the ‘not leaving my bedroom’ phase.
Perhaps finding an activity that is appealing enough to override the anxiety might help? Even if it takes ages to build up to actually doing it?
My DS picked special interests that were on the cooler side (skateboarding, the music of Nirvana) found casual, no pressure friendships that way. I hope that even more niche interests might lead to a small community of sorts?
Try not to think about what your DD’s peers are up to, your DD may well find her way to similar destinations in her own time, eg uni as a mature student when it’s easier to concentrate on the learning without the horrors of being thrown into a flat with a bunch of perplexing (and loud) 18 year old strangers.
Do what you can to protect your DD’s self esteem (which can be hard when dealing with various assessments and writing out applications that document difficulties in minute detail) and to reassure her that there are more opportunities to adapt the adult world in ways that work for her than there are in the school years.
The best thing I ever accessed after my DS diagnosis at 13 was a short course for parents run by the occupational therapist service - it really helped me understand sensory issues, to make simple changes in the home environment and learn to ‘pick my battles’ (eg my DS had meltdowns in the supermarket, once I learned it was due to the sensory overload due to strip lighting I changed my shopping habits and pretty much halved the meltdowns. As he got older some of the sensory issues changed/faded and now he works in a co op part time while studying. He still hates Tesco tho! I think it’s just too bright/white for him!)
Have a look around and see what’s available to help you, help your DD, especially if she’s currently reluctant to engage with services or education directly.
Also, ask everyone you have an appointment with or speak to re: any NHS/Education stuff for their full name, job title and contact details and keep a record.
Get a copy of every bit of paperwork and keep it in a big folder as a ‘master copy’ (don’t give it to anyone but let them make their own photocopies while you wait). You never know who you will need to speak to again in the future and you don’t need the hassle of a wild goose chase trying to
track down old files stored in dusty cabinets in the back of beyond.
Contact your GP re: getting permanent permission to speak to them on behalf of your DD (she’ll have to consent in writing) because it gets a lot harder to effectively advocate for adult children due to privacy laws.
The NHS is moving away from giant paper records towards digital records and app access, which is theoretically great but absolutely useless if it can’t be accessed when needed.
Best to try and keep a paper record for when digital records fail, plus you can organise your own records by whatever index suits you, rather than one imposed by NHS IT systems.
Hopefully in a few years time your DD will have made it through the adolescent years, have worked out what outside adaptions she needed to make the world to work for her and will be carving her own groove and you will be replying to other parents, telling them to keep their own records!