to be honest, sugar is pretty annoying and people are only bring up the "she's autistic" response as a defence.
badspot said it best;
Well with cases like Doaler and Teh Docter, these kids have just been dumb young kids, not actually autistic.
If an autistic girl with some communication problems and other issues finds Blockland to be a thing to escape to, why stop her? It honestly reminds me of the time when i was 10 and i got this game for my birthday. It was probably the first game ever that i felt was "right" for me. It was especially important to me since i could express my creativity while playing it, creating all kinds of different worlds in it.