Kate is a mom to three girls (born in 2016, 2018 and 2020). Kate and her family moved to Waco in 2018 for her husband, Zach, to begin a PhD program at Baylor. Although they miss the four seasons of the North, the Mills family are happy to be planted in Waco.

In November 2021 Kate came on board on staff at Mosaic as the Administrative Assistant. Kate loves checking things off to-do lists, streamlining procedures and being early to everything (made much more difficult by three children).