The obsessed admirer allegedly broke her beloved Chihuahua's neck after a desperate message to four of the band's five singers went ignored.
She initially tweeted the boys from her @illumivato account on Aug. 29, according to widespread reports in South American and Spanish media.
"Follow me or I'll break my dog's neck," she wrote in a post accompanied by a snap of a pooch being pinned down on the floor.
Unsurprisingly, her message was not picked up by the "Live While We're Young" warblers, who receive millions of tweets every day.
Fed up with the lack of a response, she again took to the microblogging site several days later.
Writing specifically to Liam Payne, she reportedly wrote: "I love you. Follow me. My dog has just died."
One Direction receive millions of tweets each day and didn't reply to the threat.
She included a picture she said showed her in tears as she cradled a little dog that appeared to be dead.
Fans of the band, dubbed "Directioners," were outraged by her alleged antics and swiftly condemned her.
Labeling her a "psycho," they urged Twitter to ban her account. One was so angry she set up a Change.org petition to get her removed.
Mya Fhya, who has so far attracted more than 2,500 signatures to her cause, said the girl had also posted other distressing images.
"She has pictures of animals in blenders, a dog with guns up to its head, a picture of her strangling (what looks to be her mom) [...] basically implying that if she does not get more followers she will kill all of these beings," Fhya wrote.
The @illumivato account has since been suspended.
Some have said that the story is a hoax or that the pictures she used were not of her own dog and that she was simply trying to grab the singers' attention.
The girl's real name and location have not been revealed. One Direction has not yet commented on the incident.