I'll take a crack at this:
Calls: Are a nice breed. Since noise factor is not a problem you should be fine. However, Call ducklings are very fragile when young so she must be extra careful when handling. Will you be buying locally? Because most people do not ship call ducklings. You said she liked the cuddly factor which is common for most bantam ducks. Silkies, Australian Spotted, and Black East Indie could be more hardy call alternatives.
Welsh Harlequin: A gorgeous breed that is fairly calm depending upon where you get your stock. They are quieter than most calls and females lay decent sized eggs. They have been known to go broody which could be a benefit if you want them to hatch out babies from your other birds.
Runners: I'm sorry but I would not recommend these for children. They are truly unique but all of mine seemed to be flighty. They are a bit more high strung than other breeds which I would worry about around a young child.
Pekins: Some people find them to be a "Boring" breed but I've found most to have a great personality. They can be a bit heavy which means they would go through more feed them some of the other breeds. However, they do lay some decent sized eggs for consumption. They aren't really a broody breed so you wouldn't have to worry about too many offspring.
Crested White: Please stay away from ALL crested specimens. They are much more prone to neurological issues than non crested ducks. I have first hand dealt with this issue and I would NEVER want a child to have to witness a seizure episode like that.
Ancona: I don't have experience with this breed but they are gorgeous.