I've got Jack's boots that he's used the last 2 years. Rear entry. Says 17.5 on the bottom. He used them when he was 2 1/2 and 3 1/2, too small now that he's 4 1/2. How old is your daughter?
Jack has big feet so they might fit. Best I can figure is they are made to fit a foot that is 6.89 inches long. We are ready to give them away so let me know. I've also got an Obermeyer jacket and bibs that are going too. They are a little too small for Jack and he's 42.5 inches tall now, so if she's a little shorter they will probably fit.