Thanks for your query.
Normally kids are energetic and do not get easily tired.
Although a child may get tired after long day at school,playing but by morning she should be up if she sleeps around 7-7.30 pm.
Get her investigated by discussing with your Paediatrician to rule out anaemia
or any other medical condition causing this.
I would suggest you to consult a Paediatrician and get started on multivitamins and calcium supplements
Hope this answer is helpful.