Kindergarten in canton Zurich is in a transitional period. Last year the second year of kindergarten was made mandatory for the five years old and next August, the first year will be mandatory, too. This applies to other cantons, too, and is part of a national harmonisation project. It's very unlikely though that all cantons will introduce this rule at the same time. Search the forum for HarmoS if you want to know more about the changes to come.

I suggest to contact the local school authorities for specific information about kindergarten and investigate possibilities to make the move easier for your daughter.