We had a lot of trouble with this too. Our daughter has Sensory Processing Disorder, and she has one speed: SLOW. She's now almost ten, and she's still SLOW. I mean, I've never met anyone who's as slow as she is. We have a ritual in the morning for when she has to get up. The dog sleeps on my bed, so me, the dog, and my daugher all have to cuddle and kiss, etc., for about 5-10 min (used to be longer, but I'm getting it to be less time) before she gets out of bed. If the cat jumps up on the bed, then we have to cuddle with him too. She gets on the bus at about 7 am; I wake her up at 6:10 am; she doesn't get out of bed until 6:20/6:30 am. Then it's a rush and a push to get dressed, fed, get lunch made (she has a lot of food intolerances so usually takes her own lunch), and get her ready and out the door on time. It doesn't pay to force anything, because if I force her to go fast or do something that's not in her routine, then she throws a tantrum and gets stubborn. Every once in a while, she'll whine and refuse to cooperate. That usually happens if she went to bed too late or if there's an issue going on on the bus. Because I work at home, I can take her to school. BUT, I prefer that she not use me to get around her problems, so driving her to school in the morning is NOT used much. Your daughter could be like mine--needs lots of sleep and is extremely slow in processing her movements/getting revved up. Or, she could be manipulating you. Only you'll know for sure, as you live with her and know what she's been like since day one.
My daughter starts Intermediate school next year (5th grade); the bus picks up in our neighborhood at 6:30/6:40 am. Oh joy. Can't wait to begin that daily get-out-of-bed struggle. And, she'll be riding bus with high schoolers. Yeah. Can't wait. Not! I might be posting here myself this fall, looking for help! =)
Good luck.