Months after she was kicked in the head, an IL teen wakes up every morning thinking it's June 11th.
Her alarm is set for every two hours so that she can revise what she has forgotten.
She also keeps a calendar in her room to remind her what day it is, as she wakes up every morning confused, thinking that it is still the day that changed everything for her.
"They told us that she may just be like this forever and I am not okay with that", Riley's mum Sarah told the US's ABC News.
On that fateful June 11, Horner was accidentally kicked in the head by a fellow student who was crowd-surfing during a dance. The injury caused Riley to suffer numerous seizures.
After the incident, Riley's mother Sarah Horner explained that when they went to get her checked out, the doctor sent her home with crutches and diagnosed her with a concussion. "They can't see anything", she said. You'll be able to't see a concussion although on an MRI or a CT scan.
"My brother passed away last week and she probably has no idea". And we inform her every single day however she has no concept about it, ' Sarah stated.
'I'm not making memories, ' Riley added.
"I know it's hard for them as much as it's hard for me", Riley told the outlet.
Riley Horner, from Kirkland, Illinois, suffered a traumatic head injury that doctors originally deemed a concussion.
She has no recollection of what happened before that day or after. "And I am not okay with that", Sarah said.
"People don't understand - it's like a movie". I want more than anything for Riley to remember her Junior Homecoming, Thanksgiving and Christmas this year!
Regardless of dozens of exams and hospital visits, medical doctors are clueless as to what's triggering her reminiscence loss and are not certain if she'll make a full restoration.
Riley's new reality has been especially hard on her and her family as nearly every new experience since her injury has been wiped from her memory. "And I'm just like really scared".
Three months following her accident, the Horner family is still actively searching for a proper diagnosis. "We need somebody that knows a little bit more because she deserves better".
"We need help", Sarah pleaded tearfully.
Before June 11, Riley was an athlete and a bright student.
Riley, second from left, with her cheer squad.