Rickheit and the child "were either sleeping or unconscious" and both were transported to area hospitals to be evaluated.
Local news first broke the story that the girl had been located and the Amber Alert was canceled.
Police say the 38-year-old Rickheit called a relative and made a comment about harming the child.
When Leeann Rickheit stuffed her car's tailpipe with clothing and left the vehicle running with both her and her daughter inside, she left a window cracked thinking it would not kill the 3-year-old, she told police in an interview, according to prosecutors.
The mother and child being sought in an Amber Alert issued Wednesday night have been found, according to state police.
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The 62-year-old was in poor health and wrote letters to his friends stating he had stomach pain and high blood pressure. A family spokesperson says his health was deteriorating, and he lost an excessive amount of weight while in detention.
The intense search for the child was led by the troopers who usually are assigned to locate violent criminals, but shifted their attention to tracking down the child whom they located by detailed interviews with people who knew Rickheit, Procopio wrote. She has a history in the Charlton area was thought to be recently traveling on the Mass Pike in that area.
Rickheit and Ella are possibly traveling in a blue 2007 Hyundai Sonata with the MA license plate 4PG 367.
Ella Abbott, 3, is described as a light-skinned black female.
Abbott is depicted as a white female with dark colored hair, darker eyes, 3 feet tall, weighing roughly 40 pounds.
On the off chance that you see both of them or have data as to their whereabouts, please call the Worcester Police Department at 508-799-8606 or dial 911.