Honestly, your daughter is started to sound like my son who cried every time I took him to Nursery School. They said he would sit at the window and cry "Mommy" for a long time. This same son developed school-phobia in elementary school and eventually dropped out of high school.
As an experienced Mom, I would say don't let a kid's tears change the plans. Children need to get over separation anxiety. The more you feed it the worse it gets.
