Personally, I found that S-Curl made my hair soft, but it didn't give me any slip, at all - and it attracted lint, which made my hair tangle even more.
Urm, my favorite BSS DC is Elasta QP Intense Fortifying - it's a moisture rich conditioner, that you could use as a leave-in and as a DC. It's chem-rich, though, and I don't know if you are trying to avoid using them on her. I've heard nothing but good about Aubrey's Organic - and I think they have a couple of DC's, too.
I don't know how much time you have, but I've found that doing anything 'time consuming' to my hair while wet is an invitation for more tangles. All I do while wet is detangle (in sections), and then I instantly slap that section into a fat braid once I'm done. Let that braid dry, and then I can manipulate my dry hair without it retangling on me in the process. I don't know if you'll have time to let her hair dry (though, on a little girl, the fat 'drying' braids could be a style in and of themselves, depending on how you part the sections), but that might be a thought.