Alexis Botello was charged with tampering or fabricating physical evidence and injury to a child, police say. Her bond has been set at $125,000.
Police say Botello's boyfriend, 20-year-old Joshua Beard, beat her 1 and-a-half-year-old daughter, Tylea Moore, to death.
Beard was charged with murder Monday afternoon.
According to the arrest warrant affidavit for Botello, Beard put the toddler's body in a car, and he and Botello drove from Arlington to a Weatherford Walmart, where they purchased gloves and shovels.
They then allegedly dug a grave under a bridge and buried Moore's body before Beard covered the grave with logs and rocks. Moore was wearing a diaper and was wrapped in a blanket.
The affidavit says that on Sunday, Botello was questioned, and she showed detectives where Moore was buried as well as where she and Beard had left two shovels.
The grave was exhumed Monday, where a child's body was found. A doctor with the Tarrant County Medical Examiner's Office later confirmed that the body found was a female child's that looked to be the age of Moore. The body was wearing a diaper and was wrapped in a blanket.
On Monday, detectives went to the Weatherford Walmart, where employees showed them surveillance video of Beard and Botello buying shovels and gloves with cash on the night of July 4.
Prior to Botello's arrest, friends and family of Botello told FOX 4 earlier on Tuesday that she was in a troubled relationship and they feared for her and her child.
Botello's father, Ricardo, said his daughter loved Moore and that Botello's alleged actions may have been out of her fear of Beard.
"I can only assume that my daughter feared for her life," said Ricardo. "Who wouldn't fear for their life after they just witnessed their child slain?"
"I know her mom was very scared because she was scared of Josh hurting them," said Amanda Bennett, a friend of Botello's.
Beard's alleged violence toward Botello was referenced by detectives.
According to the search warrant, "…Beard then started yelling and hitting Botello…" and later that night, "…Beard began hitting Botello…" As Beard was allegedly stomping on the toddler, "…Beard hit and choked Botello when she tried to stop him."
Beard was not the father of the child and had been dating Botello for just a few months.
The child's biological father, Chris Moore, is a marine and has taken the death of his daughter very hard.
In an exchange with her father on Facebook, Botello said, "Chris and I have been together this whole time and are trying to grieve together, especially him. I know I deserve no love from you or anyone."
"I want [Beard's] head, I want justice, I want him to fear the fear and the agony and the pain that he has brought down on us," said Ricardo. "What a coward. What a coward that he is."