My Sweet, Sweet Sarah

So I posted about being the Mom of the Year the other day because I sent my Sweet Sarah to school crying when she had a fever. Today she was crying again. It seriously breaks my heart. I'm not sure why she is not liking school, but I hate it for her. She LOVED preschool last year. Things are different here though. She rides a bus to school and home. She goes from 8-2 instead of 8-12, and she has to lay down for a little while. She also goes 5 days a week instead of just 2. I don't know what it is that is causing her to not like school, but it's killing me. I hold it together until I get in the house (can't let her see me cry), but it truly breaks my heart! Any ideas on how to help her?