Check to see if your school will have some "kindergarten orientation" days during the spring. Many schools do this for just the reason you have raised - they help the kids and the parents get ready for kindergarten. Often the kids get to actually go to school for a few housrs and see some of the things they'll do in kindergarten. If your school doesn't do this, ask if you can bring her to school a few times to wallk through the corridors and see where the kindergarten classrooms are. Ask if she might meet next year's kindergarten teachers.
Enrol her in a play school or nursery school this spring, even if only for one day a week. It will help her get used to school-like routines.
If she will go to school on a bus, go to the bus stop with her several times through out the spring so she sees what happens and sees happy kids getting on and off.
Don't let her know you are worried about it. Tell her it will be one of the biggest greatest most wonderful adventures of her life, and it will be a fun time. That way she will be less anxious about it. Let her know you are perfectly ok with it.
Tell her good fun stories about your own first day of school (even if you have to make them up!!).
Involve her in the "getting ready for school" process - buying clothes, school supplies, etc.
I hope these thoughts help. Probably the most important thing is for you to relax about it. She will be fine!! :)