Bad nanny sighting New Rochelle

This nanny was at the New Rochelle Library this AM, with 2 children, a boy between the age of 1-2 yrs and a baby girl. The nanny was physically rough w the boy + intimidating, she roughly handled him at least 4x in ten min. The baby girl very nearly fell from her lap, her head falling back abruptly. I don't feel this nanny is fit for kids, especially so young! I alerted library staff.