Early Waking - Tucson,AZ

Get an "OK To Wake" alarm clock. There are a few different versions. You can find it on Amazon. It's worked beautifully for both of my kids that would otherwise be up at 5am each day.

Basically, it changes color at the time that you set, that tells them when to wake up. My son's clock turns green completely. My daughters has a stop light that turns green.
Then you just need to discuss that they are to stay in bed until the clock says they can get up.

My son is 5, my daughter will turn 3 next month, for reference.

I am going to assume she goes to be early. At 3.5 she could go to bed as late as 9pm and still get the sleep she needs and wake up at a reasonable time. If she sleeps from 9pm to 8am that is 11 hours. My kids went to bed at 9pm from the time they were very small. Even under a year old. They all slept until 7:30 or 8am.

No sleep issues with waking early or battling bedtimes, none of those.

We had fun in the evenings, we'd go to T-Ball games, soccer practice, dance classes, gymnastics, have movie night, the kids play outside with all the other kids in the neighborhood that all go to bed after dark in the summer, etc....

I suggest you consider her bedtime. If she goes to bed later in the evening then she may just be between growth spurts and is not needing the sleep time to grow. Once she starts another growth spurt she would normally start needing a bit more sleep. Until she wakes up suddenly to shorter pants and clothes that fall off because she got thinner...well, she may just not need as much sleep as she used to.

Kids grow, they need less sleep, they grow then plateau then they eat like an oinker and chub out then suddenly wake up taller and their body weight is all stretched out. When they don't need the sleep they don't sleep.

We never did the alarm thing but told our daughter she could not get out of bed until the sun was up. I think that was easier to comprehend than the digital clocks.

I think the best thing to do is have her go to bed later so she won't wake
up as early.
She is most likely getting enough sleep.

My oldest daughter did this, and a regular digital clock did the trick. We put a piece of masking tape where the 7 would be on the clock when it was time to get up. She could get up before then to use the restroom, but then come back to her bed. She was allowed to read in bed if it was after 6 am.

When her little sister started waking too early and was young, we got blackout curtains. They worked wonders!