Traveling just before/during first SDIT heat?

We’re driving across several states and back to pick up a family heirloom just as my girl seems to be going into her (breeder mandated) first heat before spaying.

I have diapers, both cute and disposable, suspenders, a bodysuit if she doesn’t like the suspenders and her normal travel cleanup kit.

Am I missing anything? Any tips or tricks? I’ve always owned rescues that get spayed before they leave the shelter.