Kindergartener is ALWAYS tired

My daughter goes to bed around 8pm every day and usually wakes up on her own around 7:30am. She gets on the bus at 8:30 and is home by 4. she doesn’t do much after school, usually watches 30min of tv while having a snack, plays with her brother, has dinner, plays some more, then bed.

She has Girl Scouts until 5 one day a week and bball another day from 6-7.

This child is ALWAYS exhausted. Every morning she is like a baby zombie and then after dinner she becomes sooo emotional and tired. We’ve tried putting her to bed earlier but she ends up just waking early.

I don’t know what else to do? I feel badly for her because she’s just so tired. It also makes our evenings hard because she becomes a turd. lol