My daughter is 13 in September so a younger tween/nearly teen.
She stims much more obviously now. She paces while clearly in her own world, can't cope without the trampoline and will bounce in all weathers (brushing snow off it in winter!). She sucks her thumb a LOT (and has increasingly from age 3), and twiddles her hair. She didn't used to pace until maybe age 10 or 11?? Maybe 11?
As a very young child she didn't seem to have any separation anxiety, but as she got older it got worse. She would always ask if a party was 'a drop off party' straight away and be far more wary if it was (though might still have gone)
When younger she did Brownies and Pony Club and after school craft club.
She has always been very direct and so comes across as rude. This is more obvious now she's older and very tall and so looks even older than she is.
She is more anxious about busy places now.
She hasn't been to school in 16 months now after hitting crisis there in Y6 but was always very capable academically, top third of the class for literacy and just about okay for maths, fine with everything else. She has been diagnosed with suspected school trauma and school phobia now.
She's always struggled with friendships and played with younger children at school. She does have a kind-of new friend now who's also diagnosed autistic and has always had friends at school and still has 3 good friends (she's also been out of school a similar amount of time to my DD and about the same age, just 3 months younger I think).
She isn't shy at all, and will talk to anyone (which is a worry, she'd consider anyone with a dog totally safe to talk to and share any information with for example). This isn't a current issue due to the difficulties getting out of the house which have been ongoing since she hit crisis 16 months ago. Now she rarely goes out, and fir very specific things- riding lessons once a week and equine learning twice a week is usually it. If she does agree to come out she would appear fine in public usually and is a professional-level masker.
If she starts to get anxious it will come out as anger/aggression or increasing need for control. We are wondering about a PDA profile of autism.
Very limited diet but eats and seeks sugar. She's eaten eg a whole block of fondant icing she found in the cupboard secretly. I think this is more a dopamine seeking ADHD thing though.
She was diagnosed autistic aged 10 after a 2 year wait on the NHS. She is currently mid ADHD assessment and we'd be surprised if she wasn't diagnosed (as would be last primary school, family support worker and psychotherapist). And yet some days I still get massive imposter syndrome as she can seem so "normal" to me.
Sorry to hear your DD is struggling so much.