Did your DS ever use patches to try to strengthen the muscles in the eye that turns? Sil had the same problem & so did a friends dd. Both used patches over the good eye at around 2. For quite a while. Pretty sure sil was still using patches when I met her at 7. Just for a few hours here & there.

A friends dd had surgery to fix hers, but she was just a few months old. Maybe they prefer to do it at a young age?

Sorry, I have no personal experience, so I'm not much help.