Maybe Someday by Ede Clarke

In Buffalo, New York, Patti—an accomplished librarian (or young professional in some publisher listings) who prefers books over romance—changes her life to become a nanny for five children ("The Five") after a family tragedy.
Caring for the children forces Patti to confront her own past experiences with family abandonment and romantic disappointment, helping them overcome hidden truths. However, just as hope begins to emerge, another tragedy strikes, leaving Patti to decide whether to lean on her career or find freedom and peace in the truth.