Thank you everyone for very helpful feedback.
It is interesting that the concensus seems to be to let her relax and enjoy herself.
I am afraid that she will fall behind the kids in the better schools - we are pretty stuck where we are. So it is good advice to do more so that it is time to take tests for middle school, DC has a really good chance and solid preparation.
I think the advice here is great. I will let her do after-school and enjoy herself, offer her CTY IF she wants to (and let her drop it if she really hates it), making sure that it isn't a canned course. And whatever I do I will keep supplementing but not making it so awful that she feels unhapply.
Great and balanced advice.
Any experience with the literature options at CTY? I see there is a book series on dragons pitched for 5th grade but adapted for the 2nd and 3rd grade readers. That might be something to *try* over the summer.
Grateful for great advice!