I won't worry about this for your DD10 especially since she has coded before. I rarely sign up my two DS for technology camps that their age mates are attending. If the camp organizers are strict about age/grade level, I look elsewhere. The only time I have been concerned about age was for a coding class that had a rowdy bunch of middle school kids in it (my DS are in elementary school).
I do have experience of a Youth Spark camp, my DS9 (then 7 years old) attended a film making YouthSpark camp for kids aged 11 years and above two years ago. The instructor couldn't say enough good things about him and how he was getting on in class whenever I came to pick him up after camp.
