Get a good evening schedule so she can get a good nights sleep. Children thrive on schedules and routine. She has to have that good sleep each night.
Make sure at night she has already picked out what she will wear the next day. Ask what she would like for breakfast the next morning. Make sure her backpack has everything in it so there is no last minute, running around.
Our daughter (and I) are not morning people. We do not like to be awakened with a lot of racket questions and chatter. I used to wake her up 15 minutes earlier than necessary and give her "5 more minutes" of sleep.. And then maybe another if she was still totally out of it, This gave her a little control over when she was waking up.
I told her once she ate her breakfast she could watch a video or a show for the amount of time til it was time to leave.
The other thing she loved was inviting a friend over after school so they could play. I would give them a snack, they would do their Homework and then could play till the parent picked up the child or until I took the child home.
This gave our daughter something exciting to look forward to.
See if there is a child or some children at school your child would like to invite over.. Quietly, ask the parent before you suggest it to your child so they are not disappointed if the parent is not ok with the idea. Only 1 child at a time at this age.
Be sure to be excited about what your child is learning and doing each day. Talk about what they will be doing the rest of the week and how she "would not want to miss out on that".. How her fiends will miss her if she is not there.
This is a big change and not unusual. Most times, I bet when she gets there she perks up.