I work with kids the same age with intellectual disabilities. I'll try to think of some things my class like:

Sand pit toys? (If she has access to a sandpit)
Books
Duplo (could help develop her fine motor skills) - or other blocks
Stickers (my DD loves the foam stickers you can get where you just peal the paper off).
Paints
'Marble run' toy (I rekon you could look it up, I think that's its name - you make a track and marbles run down it)

I'll come back if/when I think of more