The sparkly outfit: As a mom of two little girls, I can say that on more than one occasion, they have been "busted" for going to bed, NOT in PJ's, but in their (expensive) sparkly dance recital costumes or new girlie dress up clothes from Toys R Us. The covers pulled up to their chin is the giveaway.
Damon said when he last looked in on Danielle, the covers were pulled up to her chin. I'm thinking she put her PJ's on at first, then changed into the new sparkly outfit to sleep in. (It's a 7 year old "I Want To Feel Like A Princess" thing). She hears Damon walking towards her door to say goodnight and UP come the covers so he doesn't see. (This is something that easily would get past a dad).
OK, so, with the assumption that she dozed off in the sparkly outfit (PJ's now laying inside out on the floor) this child would have sparklies ALL OVER HER and they would get all over anything else in transfer. Even if she took the outfit off and slept unclothed (which my girls have been known to do because PJ's are too hot/too itchy/wrong color/just to p*ss mom off, etc.) there would still be sparklies on her body and in her hair.
Find that trail and there's a pretty solid connection.
IF DW took her, there would be sparklies SOMEWHERE in his properties.