Skechers Unisex-Child Sparkle Lite-Unicorn Craze Sneaker

Where is the size chart.. my daughter feet is 5.1 inches

My daughter wears a size 12 is that a size 2 in little kid?

I want to order these for my 8yr old, she has wide feet would they be too tight even if i size up?

my 8-year-old needs size 2.5 in us kid shoes, is that little kid or big kid size?