Sit down with a cuppa while you read this because it's probably not something you've ever considered and for some people it's not something they even want to consider.
There are some markers that would suggest neurodiversity in your descriptions of your DD's behaviour.
For example www.staffordshire.gov.uk/Education/Access-to-learning/Graduated-response-toolkit/School-toolkit/Communication-and-interaction/Social-communication-autism/SEN-support-in-school/Autism-in-Girls-checklist.pdf
Also see checklists for ADD, ADHD, Dyspraxia as many neurodiverse conditions have several traits in common.
Many ND children are emotionally around two thirds of their chronological age, you can't make them mature any quicker than they can naturally do. You cannot make them resilient, they need to develop at their own pace.
The older they get, the more they are visibly different to their peers in some behaviours and the more difficult social interactions become for them as their interests and comfort levels are seen as 'babyish'
For starters, speak to the school SENCO and ask if school have any concerns. Some are brilliant and will have noted any issues and put interventions into place as a matter of course, some are frankly rubbish and most are somewhere between the two.
If school say she's "fine" at this stage, that's not automatically a reassurance.
Girls can present very differently to boys and most checklists are for the male presentation of conditions, so girls are often overlooked.
Also girls can 'mask' which means they can act as though they are managing well socially on the outside, but inside they aren't coping very well, their behaviour at school and at home tends to be very different. e.g. I'd lay odds your DD doesn't have the anxiety about you leaving her at school that she has about you leaving her at home.
Your next step will be to approach your GP with or without support from school, with an outline of all your DD's differences and ask for a referral for assessment. Only a team of trained professionals, usually Paed, ed Psych, OT and SaLT can diagnose. The process can take a long time depending on which area you live ( many were 18 months to 2 years pre-Covid) and how many kids are already on waiting-lists, so it's better to get into the system as soon as you can.