u/Front-Impression4765

Can someone help me out here? I'm so confused with the size chart and the "live chat" is certainly not helping.

My toddler's foot measures 5.2 inches. Giving a little wiggle room, I decided to order a size 8C which says is a foot length of 5.5 inches and the shoe is HUGE. She certainly will not be able to wear this shoe for at least another year. The AI chat says I should order her a size 5C, but that's a foot length of 4.5 inches.

So what size do I order and why doesn't the size chart actually have accurate foot lengths for their sizes? I used my points to order the shoes so I can't even return them without losing those points.