A 19-year-old Indiana woman accused of trying to poison her 11-week-old niece by crushing painkillers and adding the powder to a bottle of breast milk has pleaded guilty to attempted murder.

Sarai Rodriguez-Miranda of Fort Wayne entered her plea Monday morning.

The (Fort Wayne) Journal Gazette reports that Rodriguez-Miranda was angry that her mother was allowing her brother, his fiance and the baby girl to live with them for longer than expected.

Rodriguez-Miranda's mother saw text messages outlining her daughter's plan and retrieved the bottles of powdered milk. Court documents show that one bottle had a greenish circle and was a different color than an untainted bottle. Doctors checked the baby but found she had not been poisoned.

Rodriguez-Miranda is to be sentenced May 18.

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Information from: The Journal Gazette, http://www.journalgazette.net