Thank you for help will be looking at these dietary concerns.
If your granddaughter is diagnosed with autism, I would like you to know that according to some research (which may or may not be known to or accepted by doctors) there can be a connection between autism and the dairy protein Casein, which cannot be properly digested by some people and can produce a by-product called casomorphines, causing problems such as autism. The solution to this problem is to remove all dairy products from their diet, as traces of casein can remain in any part of the dairy product (such as the lactose). I hope that whatever is the cause of the problem, that an accurate diagnosis can be found for your loved one, as it must be very concerning for you all. Here is a link which may be helpful:
http://autism.healingthresholds.com/therapy/casein-free-diet