I wouldn't worry too much about the scores if you're confident in her abilities. She may be sick of taking these tests. Maybe you could give her a brief reading test yourself if you have any concerns and then not focus on this so much during your time with her. She certainly sounds way ahead of the curve. If she is reading at that level, she can't really have any issues with K reading expectations, IMO.
I don't really quiz older kids when reading with them. (I did this more with my toddlers.) I may sometimes ask them questions like what Dude suggests, but I am very light on this. I correct mispronunciations, but don't ask them about them again or anything. I may ask "Do you know what X word means?" but I probably wouldn't explain an expression like "on the nose" unless it seemed very crucial. I don't like to interrupt stories either!
