UGG Unisex-Child Fluff Yeah Slide Slipper

What size can i get if im a size 6 ?

Is the fushia color the same as the regular fushia pink because the color don’t look the same.

My sister wears a size 3 in youth would size 3 still fit or do I go a size up or down?

Am i able to return these in exchange for a smaller size?