In the immortal words of Katy Perry, she's hot then she's cold, she's yes then she's no, she's up then she's down, (and I'll ad lib the rest) she's cranky then she's happy, she's hungry then she's not. She's charming then she's feral, she's on the floor limbs flailing, then curled up playing cubby houses, she likes Barbie then she doesn't, she wants to cuddle, then she's in attack-mode, she's sleepy then she's wide awake.