Yep, autistics are literal. My son always used to poke others' eyes all the time. He used to break everything. My son used to be nonverbal, aggressive, and very impulsive until I put him in private therapy/program and on Nemechek Protocol. He starts to say more words and words over the time. He is able to say a whole sentence. I homeschool him part time. He can write and read. We encourage him daily to express his feelings instead of self-harming. I spent years reading and reading researches and medical studies on my free times. My son loves video games. It made a huge difference for him and encourage him to speak more words. It soothes him. Can your daughter read and write? Does she have a tablet, and use Proloquo2Go? Proloquo2Go is my favorite communication app. My son still uses it despite he speaks. I make sure he is comfortable.
Try to remove all seed oils from your kids' diet. Sunflower oil, Safflower oil, Soybean oil, Canola oil, Peanut Oil, and Corn oil. I know it seems a lot, but it made a huge difference for my son and parents of autistics. They all contain high omega-6 oils that cause inflammation to the brain and gut. 70-80% immune system is in the gut. You may be surprised omega-6 oils are in almost everything, even restaurants. I can't take my son to fast food restaurants anymore because they all use omega-6 oils. I make all meals for him at home.
In the 80s, the restaurants and companies used animal fats to make cookies and meals. In the early 90s, animal fat used to be demonized at time, so they removed it and use omega-6 instead. Medical studies point out that many subjects develop mascular degeneration and blindness by consuming seed oils. Doctor mentioned that 170 million people develop mascular degeneration alone in the US. My dad was one of them. Try that approach and hopefully, blindness will slow down. If it didn't work out, it is a good chance she may have genetic predisposition.
If you are interested in hearing Nemechek protocol, I can be glad to send you links. There are a few facebook groups where you can talk to parents of autistic children.