Great advice, intparent! I would add that it is okay IMHO to explain to her that the older kids she notices as being more like her are simply at a more similar mental level than kids her own age, and leave it at that. It's just a fact of life; she's going to notice differences between her and other people.
If she's always going to find other kids a less than perfect fit, maybe there are ways to help her appreciate others more. I dunno, but it seems like a useful skill to do that. I'd try to find ways for her to interact more with older kids, where she won't hopefully feel so hampered by playing with the other kids. There's got to be at least one older kid, even hopefully on a remote island in the Bering sea, that doesn't go through walls on mazes.
