[name_f]Eliza[/name_f] [name_f]Belle[/name_f] takes my vote.
[name_f]Eliza[/name_f] [name_u]Kit[/name_u]! So unexpected and quirky! [name_u]Love[/name_u] it!
Oh I love [name_f]Eliza[/name_f] [name_f]Belle[/name_f]!
Based on your description I like [name_f]Eliza[/name_f] [name_u]Kit[/name_u]. [name_f]Eliza[/name_f] [name_f]Belle[/name_f] is nice too, but it is very feminine so would not suit every girl. Have you considered [name_f]Eliza[/name_f] [name_u]Bell[/name_u]? I think it’s just as pretty but a little less girly.
I would pick [name_f]Eliza[/name_f] [name_u]Kit[/name_u] or [name_f]Eliza[/name_f] [name_u]Scout[/name_u]! Personally, I would pick [name_u]Kit[/name_u] as I could honour a [name_f]Katherine[/name_f] with it. But, I would steer clear from [name_f]Eliza[/name_f] [name_f]Belle[/name_f] because, although it is gorgeous, it sounds a bit too much like [name_f]Elizabeth[/name_f] to me, and it also seems a bit frilly / girly and you said you wanted her to know she can be anything, but [name_f]Eliza[/name_f] [name_f]Belle[/name_f] feels too girly.
But you can’t go wrong between [name_f]Eliza[/name_f] [name_u]Kit[/name_u] and [name_f]Eliza[/name_f] [name_u]Scout[/name_u]! I might be leaning slightly towards [name_f]Eliza[/name_f] [name_u]Scout[/name_u] for you!
[name_f]Eliza[/name_f] [name_u]Scout[/name_u]! So classic yet spunky and charming.
Aw! I really like them all. I lean towards [name_f]Eliza[/name_f] [name_u]Kit[/name_u] and [name_f]Eliza[/name_f] [name_u]Scout[/name_u] but [name_f]Eliza[/name_f] Bells is lovely too.
Me too! [name_f]Eliza[/name_f] [name_u]Kit[/name_u] is fabulous!
[name_f]Eliza[/name_f] [name_u]Scout[/name_u] is my fave! Full of spunk and life. 
[name_f]Eliza[/name_f] [name_u]Kit[/name_u]!
I like [name_f]Eliza[/name_f] [name_u]Kit[/name_u]! To me, [name_u]Kit[/name_u] is a very masculine name as I have a very rambunctious nephew named [name_u]Kit[/name_u]! But I can totally see it as a sweet, cool name for a little girl and it is a lovely tribute.
If you were to go with [name_f]Eliza[/name_f] [name_f]Belle[/name_f] then I would wonder why you hadn’t chosen [name_f]Elizabeth[/name_f] (I have two friends who have used [name_f]Elizabeth[/name_f] because they wanted their child to be able to choose any nickname… one goes with [name_f]Lizzy[/name_f] and one with [name_f]Beth[/name_f], but personally I would choose [name_f]Eliza[/name_f]!). [name_f]Eliza[/name_f] [name_u]Scout[/name_u] is cute but it doesn’t roll off the tongue as easily as [name_u]Kit[/name_u] or [name_f]Belle[/name_f].
I love the sound and look of [name_f]Eliza[/name_f] [name_u]Scout[/name_u]!