The baby was not harmed in the incident, however reports state that the milk which was stored in a refrigerator had the equivalent of nine Excedrin tablets or capsules.
Authorities allege that Rodriguez-Miranda was angry that her brother, his fiance and their daughter had been staying with her and her mother at their Fort Wayne home, and that her mother had agreed to allow them to stay longer.
In one, she allegedly describes mixing crushed pills into breast milk for the infant, writing that "I hope she dies".
In other texts, she wrote "I hope she dies" and told her boyfriend that, "I thought it was amusing that I don't have an ounce of guilt".
Police said Rodriguez-Miranda remained at large as of Thursday and is believed to be living with her boyfriend somewhere in MI.
After discovering the text messages, the suspect's mother found a bottle in the fridge with "residue at the bottom of the bottle and a greenish-colored ring", according to court documents obtained by the paper.
According to the affidavit, one of the text message from Rodriguez-Miranda read, "Yeah I thought it was amusing that I don't have an ounce of guilt".
Later, she wrote him: "omg (oh my god) I forgot to tell you, the bottle is gone". One of the text messages included a photo of a mortar and pestle with a white powder. Rodriguez-Miranda's mother and the baby's mother took the infant to the hospital.
The substance was later identified as containing acetaminophen, caffeine and aspirin, substances in Excedrin.
The grandmother also told police that Rodriguez-Miranda left the state with her boyfriend, stating that she didn't want her brother's family living with them, The News-Sentinel reported. "I don't feel bad about it".
She added that she would have no remorse if the baby died. Reports state that the woman fled MI after she got to know that she was under investigation for the alleged poisoning attempt which was made in January this year.
The suspect has been jailed under a $50,000 bond. She is still at large, and a warrant has been issued for her arrest.
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