goldmandra have you got a link that I can read to educate myself ?
I'm sorry, I've only just seen this.
AS is very hard to identify in girls. I think the average age for diagnosis is about 13 or somewhere thereabouts because the symptoms can be very subtle and attributable to just being a bit shy or sensitive.
Lots of parents of children with AS have been reassured by teachers for years that their child absolutely does not have AS. This can be because the common perception of any child with Autism is of a child who is very different and behaves in ways that really set them apart from their peers. The Ed Psych who came to observe my DD2 a few weeks ago couldn't pick her out in the classroom but she has full time one to one TA support to manage her anxiety.
Assessment is usually a long complicated process, involving lots of professionals with different areas of expertise and they are very careful not to diagnose children unless they are sure it applies to them and would be useful to them in terms of understanding and support.
Girls with AS tend to blend in. My DD1's difficulties as a toddler were mostly sensory, in that she didn't like loud noises, etc and being included in play with her peers. She was much happier interacting with adults and older children and they usually found her delightful.
This link give some basic info about AS. It's such a wide spectrum that you can't cover it in one piece of writing but it should give you an idea.
Tony Attwood has published a lot about girls with AS and how they blend in so Googling him might help too.
The difficulties your DD is experiencing at the moment are managed well by you and her childminder so it sounds like nothing needs to happen to help her. If things can be managed well when she goes to pre-school or school by them just being a bit more gentle or thoughtful around her she'll probably be fine, just a sensitive child. She may blossom in confidence before then and be in her element there.
If, when she starts in a group setting, she really struggles and gets very anxious, you'll know why. This will help you to communicate what adjustments they need to make to help her and you'll also know to get your GP to get the ball rolling for an assessment.
Trust you instincts on this. You'll know if she gets to the point where she needs more than you can give her. I did too but I ignored my instincts and listened to the people who were telling me that my girls were fine.