I see no issue with the Wii figures, if they are the ones that sit on a shelf. Those can be her stocking stuffers if they are not too pricey.
My son is Autistic, very high functioning(though he's currently seven). He's into books and art, so for someone like him, it's easy to figure out.
Is there a certain game that she likes? These days, they make books on most games. Perhaps browse Scholastic's website and find books on her fave gameset.
Personally(for a near teenager):
I'd give her her own day to be pampered like a princess--make her fave foods all day for that day, take her out to a spa and have a mani/pedi(I don't normally advocate these, but for a twelve year old, making a day to make herself confident is priceless), and a shampoo/style. I know this is not a cheap thing, but she's twelve, nearly thirteen, so grooming for confidence is the name of the game...plus it's bonding time for you Mama!
Without knowing any of her likes/dislikes/hobbies, it's hard to give you other advice. She's 12, and at that awkward stage of not yet teenager. Imaginative gifts(on the spectrum or not), are going to be difficult without additional data.
Hope this helps.