An Iowa woman who said she ran over a girl because she thought she was “a Mexican” was charged Monday in another hit-and-run involving a child, as well as in a separate hate crime — three attacks that the police said happened in a little over an hour.

In an episode that gained national attention, the woman, Nicole Marie Poole Franklin, was charged after she told the police she ran over a 14-year-old girl because she thought she was “a Mexican.”

That case was one of three episodes that unfolded on Dec. 9, according to the authorities.

On Monday, she was charged with attempted murder in a separate hit-and-run case involving a 12-year-old boy, the authorities said.

In that case, Ms. Franklin, 42, struck the boy, who was walking on the sidewalk of a Des Moines apartment complex with her Jeep Cherokee just before 4 p.m. local time, the police said.