Before you tell her the name of her diagnosis, try and have some conversions, reading together and watching you tube videos around how being different and doing things differently is NOT wrong. It's good to be able to see things from a different perspective.
You'll have to vet everything first and make sure it's suitable for her to understand, but a slow drip-feed may well help, rather than a huge shock.
It's so important that our kids understand that different can be sought after.
Try and find some examples among people she's interested in.
The usual analogy is computers, Mac and Windows can get the same results, they are both computers, they can both do the same things as an end result, BUT they are very different in the WAY they do these things.
Windows is very common and most people use it, but Mac is more rare and more expensive.
Cars, most in the UK are manual but a smaller number are automatic.
Both types get you to your destination, but they do it differently.
Can you think of any area she could relate this type of analogy to herself?