“The Dean” hates to think that she’s become one of those people who says, “Send both sets of scores” but (gulp), that’s what she’s saying.
I don’t know where your child is applying, so my advice might change if I did. I also don’t know the full breakdown of both sets of results. However, a growing number of colleges are now “Superscoring” ACT results, so it’s probably worth the extra bucks (if they won’t break the bank) to send everything.