I have KP, as does DS2. I have a solution, too - Amlactin 12% lotion. It's pricey and hard to find - Walgreen's has is, it's $13/bottle. I've heard that Costco sells a big container for the same price, but there isn't a Costco near me.
Please, please, please check with your pediatrician before you apply it on your child, and if the problem is that YOU don't like it, I wouldn't put it on her - it's her body, and her "flaw", and if it doesn't bother her, why make an issue? I've had it forever, and I didn't care until the "vanity years" (early teens). I've not used it on my son, because he's 2 and he doesn't care. If it's bothersome to him when he's old enough to have an opinion about it, then we'll treat it.
That said - the lotion works GREAT. I only discovered it a few months ago (oddly enough, my pediatrician was the one who recommended it when she noticed the KP on my son, and I was all "oooooh....I know....I have it...I hate it!!!!). It doesn't smell nice at all - not really strong or offensive, but not perfumed at all. I put it on nightly, right before bed. It works almost immediately. I'm going to start trying every other night to see if I can maintain the smoothness with half the dose.
Good luck with whatever you decide! And anyone else with bothersome KP - RUN TO WALGREEN'S and buy this lotion!!