Not enough Sleep

For the past 5 or 6 months, Isabelle decided that she would no longer nap.  Even when it is clear that she is just drop dead tired (excessive yawning, resting her head everywhere she can, etc.), she still refuses to nap.  The only way we have gotten her to sleep is in the car on the way home - usually at around 3 or 4pm. But this backfires on us since we found that it is harder to get her to sleep at night.

This picture was taken of Isabelle just moments before she was about to eat. Conchita (nanny) had turned around to cut an avocado and when she turned around, Isabelle had fallen asleep :( My poor baby!