Some of the things your doctor recommends have worked very well for me and my two kids. I did follow the consistent wake up time 7am...with only about 30 min flexiblitity if we happened to be out very late the night before. I also followed a consistent bedtime...around 7:30. I think at your daughter's age, both of my kids slept about 11 hours per night. Then the nap. I also couldn't agree more about waking up from nap. I aimed for 2 hours...again with an occasional 30 min later. I also always wake at 4pm regardless of what time the nap started. For example, yesterday, due to my older child's preschool field trip, my little guy didn't get down for his nap until about 2:40pm. Still woke him at 4. The reason is to preserve future sleep. From what I've read...there are two reasons to wake a sleeping baby/child....(1)very young or premature infant who needs to eat and (2) baby/young child to preserve future sleep. As a new mother, I referred to the book Healthy Sleep Habits, Happy Child by Marc Weissbluth, also a pediatric sleep specialist. He says everything that your doctor did.
Now, my children are 5 and 2 1/2. The oldest goes to bed around 8 pm and wakes a little before 7am...but we've asked her to look at her clock and play quietly until 7:00. My youngest goes to bed around 7:30pm and is woken by his sister at 7:00...or wakes on his own a little before 7. My youngest also naps max 2 hours but the timing is flexible in the 12:45-4:00pm range.
I saw the other post wondering why the consult or whether it was part of a routine checkup. Good luck!