(HOUSTON) — A body discovered at a home outside Houston is believed to be that of Austin, Texas mother Heidi Broussard, who went missing with her infant daughter, Margot Carey, last week, according to a person familiar with the investigation. A 1-month-old infant was found alive at the scene, authorities said, and Austin police said DNA testing is underway to determine if the baby girl is Margot. “The infant is healthy and in the care of Child Protective Services,” police said.An autopsy will determine the identity of the woman found dead, said police. A dozen officers from the Texas Rangers, Texas Department of Public Safety, FBI and Austin Police Department converged on the house in northwest Harris County Thursday evening as part of the investigation into the week-old case, according to ABC station KTRK-TV.Authorities were focusing on a car in the back driveway of the house, KTRK reported. One person has been arrested and charged with two counts of kidnapping and one count of tampering with a corpse, said Austin police. Broussard, 33, and her infant daughter, Margot, were last seen dropping off a child at Austin’s Cowan Elementary School on the morning of Dec. 12, according to Austin police.Investigators believe Broussard and her child returned home to their apartment complex after they left the school. They had not been heard from since, police said. Broussard’s fiance, Shane Carey, told Austin ABC affiliate KVUE-TV that her car and all of her and the baby’s belongings were still at their home, and there were no signs of a struggle.Investigators tell ABC News that they feared foul play from the start because one of Broussard’s children was missing and one was left behind. Investigators said that if a mother were to run away voluntarily, she would likely take both children or neither. The couple has been together for nearly 10 years, Carey said. Copyright © 2019, ABC Audio. All rights reserved.