Kairi's hair almost always looks greasy in the back. I could wash her hair 3 times a day and it'd still be greasy.
Anytime I sit down at the computer desk, Kairi runs over to me asking for "hands" also known as lotion on her hands. I have watched her rub it into her hands several times, but it's been a while since I've insisted on watching her. Today I turned around just in time to find her rubbing her "hands" into her hair instead of her skin!
Mystery solved. And just so you know, that lotion is HARD to get out of hair, but very conditioning.