Anyone else's kids refuse hiking boots?

My 9yo will hike like 8 miles in Crocs but the second I suggest actual hiking boots she acts like I'm trying to torture her. We were planning this trail up Mount Tamalpais next month but she's already threatening to 'go on strike.'

How do you guys get your kids to actually wear proper footwear? Or am I just overthinking this and Crocs are... fine?