Its very frustrating worrying about our children getting enough sleep. Both my girls started to reduce the amount time of day sleeps at about 12 months of age. Some days they would have two sleeps lasting for about an hour each and then they dropped a sleep in the morning and would have one from lunchtime (usually after doing a poo, great timing!) for about 2 hours. Some days now my youngest doesn't have a sleep at all and she gets cranky and it rubs on me as a result. Just play it by ear. A rest is sometimes all that is needed. Do you also find that sometimes a 5 minute catnap in the car replenishes her energy levels?