This is not a strictly ADHD thing. Many, many people have difficulty focusing when reading. It is just harder with ADHD to monitor and refocus.
Kids are so smart! That is why I love working with them. They can be so resourceful and think outside the box so easily... while I am supposed to be the teacher, they often teach me more.
Aw, that sucks, but good for you for staying firm. It's hard to have patience, but you are doing the right thing for her. Thank you for the update, and thank you for being there for Sandy.