Can you contact the teacher and ask what she'd like you to do?

Our self-contained HGT classrooms work a year ahead in math, too, also using EDM. (My dd is your dd's age and grade and did 2nd grade math last year in 1st.) I've heard that teachers at our school have kids who enter the program in later grades do math over the summer so that they can start a grade ahead in the fall.

If I were you, that's what I'd do.