Here are a few suggestions :
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Ojamajo Doremi, really enjoyable and funny 200ish episodes. Still haven't finished it.
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Ashita no Nadja, more romance/adventure with a theme that matchs the 80's anime like "Princess Sarah"
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Candy Candy, a bit old but if you don't mind the very shojo style...
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Sugar Sugar Rune, I found that very entertaining. (very catchy opening)
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the crayon kingdom of dreams, same age target than Sofia but far more funny.
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Tokyo Mew Mew, old school but still very nice.
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Precure, there's a lot of seasons and a lot of people like it.
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Jewelpet , never seen this one but I'd like to.
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Paw patrol, not exclusively for little girls, but I find it very neutral : it's not as boyish as 'Miles from tomorrowland' can be. I still enjoyed both.
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Petite Princess Yucie, it's a Gainax adaptation of the "princess maker" game series that was really popular in the early 2000's
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Littlest pet shop, same team of voice actors from My little pony. It is quite enjoyable.
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Doc McStuffins a "Sofia the first" style cartoon. Lots of songs and a doctor who cures plushies. Adorable if you can endure the songs.