Kindergarten Registration for 2009-2010 School Year

I registered my daughter for kindergarten today. She is 5 years old and missed the 2008-2009 cutoff by 11 days so she was fortunate in that she got to spend an extra year in preschool. I think that will benefit her. She is attending a Montessori preschool and over the last year has gained strong social skills as well as basic kindergarten academics. She loves school and is looking forward to attending kindergarten in the fall. I am happy but sad. I'm happy that my daughter is excited and will thrive in her new environment but I am sad because my baby is going to "real" school. She wants to ride on the school bus and because of our work schedules and ability to work from home, she could do so but I can't bring myself to letting a 5 year old get on a school bus and go to school all by herself. I'm afraid I would have to wait for the bus then I would get into my car, follow the bus, and wait for her to get off and walk into the school. Next year our 4 year old will start kindergarten and I would be willing to let the both of them get on the bus and go to school together - maybe?? I don't know, this is a big decision that I can't make right now. I have a few months to think about it and right now, I just want to look forward to spring and enjoy a fun summer at our community pool.