It hit me tonight.
She knows I'm nursing her to sleep now. That's why she so good at resisting. Sometimes she even turns her head toward the ceiling and smiles and laughs. It's her way of saying "Nah nah nah nah nah nah! I'm not going to sleep!"
Starting tomorrow, a new era begins. Some new way of putting her to sleep. She knows the routine now: I dim the lights, run her bath, put on the Sounds of the Ocean CD, put on the lavender oil, and bathe her. I get her dressed, tidy up from the bath, put on the white noise (rain shower CD) and then nurse her in bed until she falls asleep, then move her to the crib. She knows exactly what's going on and that it's time to sleep.
So she must sleep. Or mommy will go crazy.