Our (not so anymore) little one rides an
IslaBike Luath 24. The saddle is a no-name padded synthetic. Probably not what an adult rider would prefer (i.e. leather), but arguably perfect for kids. She's been touring with us since she was 5. Previous bike was an IslaBike Beinn. Padded no-name saddle as well.
I doubt that saddle specification is important for kids. The bike weight is crucial however -- if you weigh 50 pounds and your bike weighs 30, it would be like a 200 pounds adult riding a 120 pounds bike. Being a lightweight rider, the saddle and the handlebars' ergonomics isn't as important as it is for adults. I don't remember our younger daughter ever complaining about saddle soreness. (even though there quite a bit of "are we there yet"
Maybe you want to shop with your daughter. The design she might care about is probably more aesthetic than performance.