J.W.
I am trying to figure out how it could be cheaper, you will still be paying her the same wage when your daughter starts kindergarten in the fall.
Anyway, big con you missed, if she gets sick you miss work. There will be no back up anymore. I can't remember which mom it is but she has had a crazy amount of expense and stress because she is having to find another sitter and still pay her nanny (or maybe it is a small day care) because of a death in the family and an unexpected illness.