I would definitely have a discussion with the teacher on parent teacher night. It is great that she is happy but the fact that she mentioned for weeks the time she got something wrong stands out for me. At some point that can become an issue and learning to face challenge is very important.

Overall it sounds as though you are in a good and supportive place and that is vital. Just talk it through with the teacher and see if she has some suggestions for upping the challenge a little.