I did something very like this in high school and it worked out fine. (I was taking calculus, but "proving" that I knew the math that I had tested out of over the summer by doing all the chapter tests for the skipped courses.)

I would probably emphasize your DH's facility with the material. Depending on your state policies, you could even characterize it as "partial homeschooling," although your DD would be doing the work in study hall instead of at home.