This is also my daughter. Her bite is perfect but the spacing between her teeth is wider than most. But she wasn't happy about it. So she got
the Invisalign purely for cosmetic purposes. She's worn the Invisalign for a year and her teeth are now perfect. She is very happy!
I should mention that my daughter got her Invisalign at age 13 (almost 14).
My son is 11 yrs. old. The orthodontist has a "let's wait and see" attitude with DS. There are no major issues with his teeth either.