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You really do have to figure out her foot width. It's important to know that when you can't try on skates before you order since different manufacturers size their skates differently. The main difference is the width. If your daughter has narrow feet, the Riedell or Risport skates will fit better, width-wise. Jacksons' "regular" width skates fit a wide foot better. (Looking at the photos, I'd suggest Jackson brand skates. Her forefoot looks wide and tall to me, but it could just be the cute socks.)
You *could* ask other skating families to let your daughter try on their child's skates to see what fits well. It's not a perfect solution (since skates change shape) but it's better than guessing.
Riedell 121's are more appropriate for her current skating level. They'll be fine up through Gamma/Delta.
Reidell 133's might be a bit stiff at first, but they'll last up through Freestyle 1-3.
Jackson Mystiques are a bad investment for her level. She needs a skate with more support and a better blade.
The Jackson Artiste is comparable to a Riedell 121, the Jackson Classique is similar to Riedell 133.
Risport Etoile is the equivalent of the Jackson Artiste and Riedell 121. They'd be okay up through Gamma/Delta, but not beyond.
Risport RF4 is a little pricey, but comparable to Riedell 133 or Jackson Classique, imo. Might be a little stiff.
A little advice:
. Ask around the rink to find out who sharpens skates well. That person would probably know who does measuring and fittings.
. In areas where is no real "pro shop," sometimes skate coaches or sharpeners will place orders, etc. Always good to ask around.
. Trace your daughter's foot onto paper and include her measurements. Send the seller this information and ask their advice about sizing.
. Look at the seller's return policy. Some will let you exchange at no charge if the skates don't fit and blades haven't been sharpened.
Good luck!