Sounds exactly like my DD who is 16 and was diagnosed age 11 with ASD and ADHD. Psychiatrist said she was only borderline for both on paper and that the diagnostic criteria is outdated, especially for girls. I was very confused at first, because I have a stereotypically autistic brother and she was nothing like him at all.
She had no need for routine, no sensory issues (except maybe sensory seeking), no food issues, didn't have what I thought of as obsessive interests (but psychiatrist said her huge interest in My Little Pony, anime and Pokémon was significant).
Issues were she would have regular meltdowns, which were basically extreme tantrums she couldn't regulate from, she would have meltdowns every day when I picked her up from school, when we had to leave the house (but she was fine when we arrived somewhere) when we had to leave somewhere, getting in the bath then getting out the bath etc I didn't know the words at the time but her issue was with transitions. She would wander off in busy places, wasn't at all risk averse. She was obsessed with looking for shiny things/rocks/shells/trinkets.
She wasn't shy, and that was another thing I thought meant she couldn't be autistic, but she was inappropriately confident around strangers, and no topic was out of bounds for her. Often being very complimentary to a random person but equally often making rude comments. She had no stranger awareness. She had no fears, no embarrassment, no sense of guilt. She pretended to be a dog/cat/dinosaur every day. She had a delayed circadian rhythm.
As a baby I could put her down in a new busy parent and baby group and walk out and she wouldn't look for me or cry. I could hand her to strangers and the same. It was hard to get her to smile but not impossible. She wouldn't sit on my knee for a cuddle, always wanting to be put down and on the go.
My daughter developed a social filter around age 12, and gradually became more inhibited and introverted. She has claimed to have friends through secondary school, but she hasn't met up with any since she finished school in June after GCSE's, and would have been happy to spend the rest of her life in her bedroom never to see daylight again. She forgets to eat, has no sense of thirst and has to be reminded to drink, has to be instructed to wash, can't tidy her room without help, has to be woken up in the mornings, can't pack on her own for a weekend away, can't take a bus without someone with her, is quick to lose her temper. She likes gaming, digital art (been drawing the same animal type characters she makes up for about 7 years), cosplay, alt fashion. These interests are quite typical for women with autism. All of her friends are neurodiverse.
Your daughter probably is picking things up from Tiktok and my money is on Discord, especially with the talk about day dreaming, (she's probably talking to my daughter about that who talks about this all the time.) And yes, these type of forums absolutely can induce some sort of contagion (especially with trans issues/self harm/suicide ideation, tics) but also, I don't believe neurotypical teenagers are going to be drawn into these type of servers. So if they are. being influenced into obsessing over how 'other' they are by the internet, and not makeup/fashion/celebrities/parties, then chances are they are neurodiverse, even if some of the things they claim are lifelong issues aren't really true.
I myself have severe ADHD and a few traits of ASD, and I do agree with the theory that ADHD is a subset of ASD.