[name]Zuzu[/name] is cute for a little girl. I like [name]Sunny[/name] for both a child and an adult, and if she decides to go by her formal name as an adult, it’s a beautiful name.
I like [name]Suzie[/name] and [name]Zuzu[/name] and I think [name]Sunny[/name] would work perfectly fine.
Other nicknames could be [name]Sukie[/name], [name]Sanna[/name]/[name]Zanna[/name], [name]ZaZa[/name], Susa, [name]Sue[/name], [name]Anna[/name], [name]Annie[/name].
I think [name]Sunny[/name] does work, and I’ll second the suggestion of [name]Sukey[/name], which is a really old, highly traditional, nearly forgotten, and absolutely wonderful nickname for [name]Susannah[/name]/[name]Susanna[/name]/[name]Suzannah[/name].
I love [name]Sunny[/name] and [name]Zuzu[/name], both are very cute! I also remember reading a book once where [name]Susanna[/name] went by Suze. It could be another choice =]
I think [name]Sunny[/name]'s cute and just fine as a nickname. I also read a series with a [name]Susannah[/name] who went by Suze, and that’s my favourite short form. Short and spunky!
[name]Sunny[/name] works all right… I really don’t care for it, though.
My absolute favourite nickname for [name]Susannah[/name]-in-whatever-spelling is [name]Zsazsa[/name]. It’s kind of over-the-top glam but I think it’s really sweet.
[name]Sunny[/name] is very cute, but she would have to turn out to be a happy child, otherwise it would be a stretch. People tended to call me [name]Susie[/name] when I was little, and then I “graduated” to [name]Su[/name]… but I prefer using my full name ([name]Susanne[/name]). A friend of mine goes by Suz. I really like [name]Zuzu[/name].
I love [name]Sunny[/name], and also the suggestion of [name]Sukie[/name].[name]Both[/name] very adorable nicknames for [name]Suzannah[/name].
Good luck!