I'm with mimi in that she may very well consider that she has given a month's notice rather than just two weeks. Expect that she is goign to start there anytime after Nov 1. It isn't really a month but since it is a change in months and she told you the first part of the month it will seem like a month to her.

Many parents are looking 3 or more months down the road for care so for sure advertise now and if you get a family that needs care within the next month then try to coordinate the changes if possible.