Every day, medical staff battle to drain the toxic waste from her body and her family fear she may need a colostomy bag or worst, that it may suffocate her.
Disillusioned with the NHS care she has received, her friends and family are trying to raise over £10,000 ($19,000) for private treatment.
Waste remains stuck
Kelly's nightmare began in August when she went into hospital – which she has chosen not to name for legal reasons – for the surgery and was admitted as a day case.
The carer, from Bristol, said: "It was a routine operation. I was home later that day and it didn't seem like anything to worry about."
But she soon realised there was something more serious wrong.
"The wound on my stomach was getting increasingly puffy and, after two weeks, it exploded, so I went straight to my GP," she said.
Re-admitted to hospital the next day, Kelly was told that she would need further surgery on her bowel.
But, even after the operation, Kelly's bowel function did not improve.
Instead she is "severely faecally impacted," meaning her faeces remain stuck in her rectum, which is now slowly leaking into her body.
Risk of bowel perforation
Kelly has struggled to go from an active horse-rider to suffering excruciating pain and being unable to keep down any food.
Furthermore, her bowel could perforate at any moment – at best meaning she would need a colostomy, which is an operation to divert one end of the bowel through an opening in the tummy.
She has spent 10 weeks lying in a hospital bed, taking a cocktail of painkillers, but still, doctors have not found a solution.
Kelly, who is single, says she has been surrounded by an incredible group of friends, who are doing everything they can to get treatment for her.
They have set up a GoFundMe page, raising over £10,000 for private treatment at the specialist bowel hospital St Mark's, London.
Spending weeks in hospital has also meant Kelly being separated from her beloved horse, Huckleberry Finn, which she rescued in a poor state and nursed back to health.
Now she is desperate to get home for Christmas and to be back with him. To donate to Kelly's cause, visit here.