“I’m gunna crush up some of these pills since she decided they can stay longer,” the teen wrote, “and kill their baby.”

The allegations come from an affidavit for probable cause filed earlier this week in the Allen County Circuit and Superior courts in Indiana, where authorities announced that Rodriguez-Miranda was wanted on a single charge of attempted murder and launched a days-long search that ended with her arrest in Michigan.

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The documents say she researched how much over-the-counter pain reliever it would take to kill someone, then crushed the equivalent of nine Excedrin tablets and put the powder in a bottle of milk.

Rodriguez-Miranda sent her boyfriend a picture of a mortar and pestle set containing the white powdery concoction, according to the court documents.

“I put the stuff in a made bottle in the fridge,” she wrote.

In another text, the teenager wrote: “Yeah I thought it was funny that I don’t have an ounce of guilt.”

Following a search for Rodriguez-Miranda that stretched across multiple days — and states — the Allen County Sheriff’s Department announced Friday afternoon that the teen was in custody in Bay County, Mich.

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Authorities had suspected that she and her boyfriend had fled Fort Wayne and headed to Michigan to stay with her boyfriend’s family. She will be extradited back to Allen County, where she will be formally charged with attempted murder, authorities said.

In the early morning hours of Jan. 12, Rodriguez-Miranda’s mother, who monitors her daughter’s phone and social media messages, saw the text exchange between the teenager and her boyfriend, according to the court records. The mother, whose name is redacted in the court documents, took images of the messages — then went to the kitchen and opened the refrigerator door.

Inside, she found two baby bottles — one of which was darker in color with a greenish ring and a residue that had settled at the bottom.

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She put both bottles in a plastic grocery sack and secured them in a zip-lock bag. Then she took her grandchild, along with the child’s mother, to a nearby emergency room to have the infant checked for possible poisoning.

Court records say the infant showed no signs of poisoning — because the bottles had not yet been used to feed her.

Rodriguez-Miranda later sent another text message to her boyfriend, saying: “Omg I forgot to tell you, the bottle is gone.”

“I know I’m excited dude. I’m glad it didn’t happen while I was here,” she wrote, adding: “Bc then they wouldn’t suspect it happened at this house and blah blah blahhh, But idk if they’ll even use it bc that bottle was in there for like 2 days before I put it in there.”

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The teen then started to question why her niece was still alive.

“Why didn’t that baby die dude that’s dumb,” she wrote.

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The text messages, which are detailed in court records, show the teen’s evolution from “They’re not gunna suspect me” to “I had a dream that night that I got caught.”

Rodriguez-Miranda wrote in one text “my subconscious is guilty,” but, in the same sentence, added, “but tbh I hope she dies. I don’t feel bad about it bc she was destined to grow up s—– or be abused.”

On Jan. 16, Rodriguez-Miranda was arrested for shoplifting.

A day later, her mother told her to be at home to talk to police about what had happened with the tainted baby bottle.

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But the teen did not return, according to the records. Her mother then gave police the mortar and pestle set, which still had a white powder in it.

A forensic toxicology report showed that the milk in one of the bottles contained the components of nine Excedrin tablets — acetaminophen, acetylsalicylic acid (or Aspirin) and caffeine.

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Authorities wrote in the probable cause affidavit that amount was “more than enough to be fatal for an adult.”

It was not immediately clear Friday whether Rodriguez-Miranda had an attorney in the case.

This story has been updated.