I see...however

from what you said, she will most likely want to come again when you have your next baby (unless you don't want any more - and that's a separate issue). I've seen many parents who come to take care of grand babies and swear that they would never come again - and yet they do! Best of luck to you and your parents. In my experience, once the child reaches 1.5 years old, day care should be fine. This is the age when socializing with other kids makes a lot of sense. Another six months probably makes marginal difference only.