A heartbroken mother said she “will not give up the fight” for her “beautiful” daughter after an inquest found she died of a rare cancer.

Elsa Locker gave emotional evidence for more than an hour about her daughter, Valencia Tyser, 21, who died on June 8, 2012, at Chase Farm Hospital in Enfield.

An autopsy had originally ruled Ms Tyser died of a septic shock, but a second investigation into her death six months ago saw her cause of death changed to multiple organ failure and leukaemia.

Ms Tyser had been on a trip to Egypt in February 2012 to celebrate her sister’s 25th birthday and discovered a rash on her upper thigh.

After getting medication from a doctor, her condition did not improve and the 21-year-old student, of Brick Lane, Enfield, was taken to hospital in late May with a high temperature.

Her condition deteriorated further and on the morning of June 8, after taking a sip of water, she suffered a cardiac arrest and never regained consciousness.

At an inquest at North London Coroner’s Court in Barnet, Ms Locker, who was wearing a shirt with her daughter's picture on it, described the events which led to her daughter’s death.

She said: "My daughter entered hospital weeks before she was seen. This is something that could have been treated a long time before she went to the intensive care."

Placards were displayed in court reading 'Justice for Valencia'.

Breaking down several times while giving evidence, the emotional mother-of-four refused to accept that her daughter died of leukaemia.

She said: "Nothing had shown she had cancer and when we asked if cancer was an option that was rejected.

"She was a beautiful and very kind girl who gave everything in life. She has lost her voice but we are all still speaking for her.

"She was highly ambitious and for the rest of my life I will have the image of her choking on the water given to her by the nurse."

Evidence early in the inquest had revealed that Ms Tyser had been given penicillin, which she was allergic to, during her treatment at the hospital.

Alexander Paulsen, who had carried out the original autopsy, revealed that he had made a mistake and the finding of sepsis expert Sebastian Lucas had been correct in giving a cause of death as multiple organ failure and leukemia.

Coroner Andrew Walker revealed that the evidence of Mr Lucas was correct and concluded that Ms Tyser died of natural causes as a result of a rare cancer.

Following the verdict, Ms Locker told the Enfield Independent: "How can the cause of death be changed, almost three years after she died.

"Something is being hidden and I will fight until my last breath for justice and for my daughter and we will not give up the fight so we can all move on."

A Royal Free Hospital spokesman said: "On Thursday the coroner concluded that Valencia Tyser’s death was the result of natural causes caused by a very rare and aggressive form of leukaemia.

"We would like to extend our deepest condolences to her family."