C.K.
Hello, I understand your problem...one thing that worked for me was to get my daughter on a very set schedule. Here is what I did with her and it took a week or so to get her adjusted, now we do not have any problems.
6:30am Wake up
7am Breakfast
8:30 1 hour nap, no longer
9am snack
12:30 2 hour nap
3pm snack
5-6pm dinner
After dinner playtime, bath, book, brush teeth
7:30pm bedtime
When she was waking up early I did not go into her room and pick her up...I would sneak up and just make sure she was ok. At first she would cry for about 20 min but eventually she would fall back asleep. Now if she does wake up she knows how to put herself back to sleep.
Her caregiver will need to follow the schedule and make sure she gets her naps in...keeping her up later is not going to make her sleep longer, it will just make her more fussy. Babies need there naps and should be taking a 2-3 hour nap during the day.
That is my advice...hopefully you can work it out.