While learning ASL is a good way to communicate with her parents, sooner rather than later she will need to & want to communicate with the wider world, and most

While learning ASL is a good way to communicate with her parents, sooner rather than later she will need to & want to communicate with the wider world, and most people can't sign. So she will likely need something like this going forwards, and as you note the bigger issue here (beyond her and her family) is the patent & Apple situation.