regression

Things have been going so well with Emma and school, I guess it was only a matter of time before things blew up in my face. Yesterday Sean was working from home, so he got up with Emma to get her to school. Well, he wasn't paying attention or something, and Emma missed the bus. She was ready to go, and they were getting ready to go outside, and they saw the bus go by. So Sean drove Emma to school, and she had a meltdown when they got their to her classroom. So of course I was nervous about today. Thankfully since the van is still not up and running, Sean is telecommuting again today and he was getting Emma on the bus again today, and he promised her she wouldn't miss it. They were outside in plenty of time, but even up in our bedroom I heard her screaming and crying before the bus even got here today. She yet again refused to get on the bus and threw a huge fit. Sean had to drive her to school again, and I'm sure she cried again.
I really don't know why she is acting like this again, but I'm about to move out if we can't get all this straightened out. I absolutely can't drive her to school every day, especially once the baby gets here. How insane will that be if I have to put all the kids in the car to drive Emma the 7 minutes to school, and then get all the kids out at school to walk Emma inside? Yes, we have to get out and walk them at least to the door because we have to park in a side lot and it's too far for a kindergartener to walk by herself. Grrrrr...