It sounds like your daughter may have either too long of
a wakefulness window or is indeed ready to drop to one nap.
Remember, your baby's
wakefulness window at this age is only between 1 and 2 hours, which means that your baby's fussing may be more that just fussing, she may be telling you that she needs sleep.
It sounds like your daughter may have either have too long of
a wakefulness window (More about wakefulness windows here: http://www.sleeplady.com/baby-sleep-problems/baby-sleep-problems-common-causes-of-early-rising) or is indeed ready to drop to one nap.
The average
wakefulness window for most toddlers is around 4 hours.
Also, know that your baby's bedtime may shift by 30 minutes some nights, especially as she gets older and
her wakefulness window increases.
Watching
wakefulness windows, looking for signs of tiredness, and remaining consistent with your baby's routine will help to ensure that he is getting enough quality naptime sleep.
This goes back to
those wakefulness windows again.
This is especially true of small children, who have much shorter
wakefulness windows than their parents.
Instead, make sure that you pay attention to
their wakefulness windows.
Not exact matches
These suggestions correlate to the average baby's
windows of
wakefulness, which is basically a fancy way of saying «the length of time you can expect your baby to stay awake between sleep times without completely melting down.
These types of naps tend to occur when
windows of
wakefulness have been exceeded, or when babies are put on a schedule that is outside of their home schedule, which sometimes occurs at daycare.
Average
windows of
wakefulness by age:
It's worth noting that if your child is resisting naps and near a «transition age» (one where your baby will soon be dropping a nap or the
window of
wakefulness increases), you may want to adjust naptimes to see if your baby is more willing to nap at a different time in the morning, or perhaps a little later in the afternoon.