Hey Melissa...
She definetly sounds OT but I bet it's more of getting worn out there and not taking the best nap that's an issue and not the total amount of sleep. Regardless of its challenges, this is probably a really structured schedule that she WILL get used to soon, I bet in a month she'll handle it much better. She's old enough to handle it and I really think she will!
Hang in there with it, it will get better!!
BIG adjustment, but one that will be really rewarding for you all (I think!)