I agree with Ladybug - she doesn't get ready/eat breakfast/etc that's her problem. Again, I think that you'll only have to do it once.
However, hopefully you won't have to get to that point. We made a "get ready" chart for my daughter. It had "get dressed," "brush hair," "brush teeth," and "shoes and socks" on it. She's responsible for checking the chart and ticking off all the parts. If she does it for a week, she gets 4 quarters on Friday. It's been a good motivator and does cut down on the nagging, which I hate.
Some kids just need time in the morning. My son is like this. He really likes a good 1.5 hours of awake time before he heads out the door. Perhaps you can try waking your daughter at 6 so she has a little time to lie in bed, get dressed a bit more leisurely, etc. Yes, she'd be losing that sleep time, but it might very well be worth it if the morning is less of a fight.
Finally, I find it helps both my kids if I tell them the night before that we are going to have to hustle in the morning to get out the door, and that we won't have time for play. It helps them to get up in the right mindset (normally).
Good luck! Think of it as good practice for high school : )