A 46-year-old babysitter with a long history of working with an Upper East Side family was arrested today after a mysterious odyssey that lead the baby's panicked parents to call the cops when the child wasn't home on time.

Beatrice Rios, who has worked for the Ceria family for four years, was supposed to bring 17-month-old Annabelle Ceria back to her parent's East 101st Street home at 4 p.m. yesterday. Earlier in the day, mother Melissa Ceria received a text saying that Annabelle had not arrived for her regularly scheduled 10 a.m. playdate with a friend. When the child didn't return home in the afternoon, the frantic Cerias called cops and reported her missing. At 5:30 p.m., Rios and Annabelle came home, safe and sound, and the search was called off.

What exactly happened between 10 a.m. and 5:30 p.m. remains a mystery. Ceria reportedly told the cops that a man stole her purse and cellphone when she took the baby to Central Park, but another witness said that Rios seemed incoherent and claimed she got lost on the subway. Police arrested Rios after she gave "inconsistent accounts" of what happened. Although the Cerias had previously described Rios as a “fantastic woman” who was “very dedicated to our family," she was charged with child endangerment, unlawful imprisonment and failure to exercise control of a minor.