Girl, 14, diagnosed with dehydration after suffering severe headaches and poor vision died months later from brain tumour Olivia Wicks was taken to hospital but her symptoms were downgraded Doctor then misdiagnosed her and sent her back home Six weeks later she was taken to another hospital, where tumour was found She died last week after a 10 month battle against the tumour Hospital has now apologised to her family and accepts 'we got this wrong' Tragic: Olivia Wicks died after a 10 month battle with a tumour which was originally misdiagnosed at Bournemouth Hospital A hospital has today apologised to the family of a schoolgirl who died from a brain tumour after she was wrongly diagnosed. Olivia Wicks, 14, went to the hospital with severe headaches, sickness and poor vision last July, but a triage nurse downgraded her symptoms, resulting in her having a six hour wait to see a doctor. She was then wrongly diagnosed with suffering from dehydration and sent back to her aunt's house in Bournemouth, Dorset, where she was staying. Six weeks later Olivia became so ill she was rushed to another hospital, but this time she had a CT scan. It revealed an inoperable brain tumour which could not be removed as it was dangerously close to her spine. Despite radiotherapy treatment, the teenager lost her 10 month battle against the tumour and died last week. In a letter of apology to Olivia's family, Bournemouth Hospital said the nurse who saw her has since undergone 'full training'. Olivia's devastated parents believe that more could have been done for her if she had been diagnosed earlier. Mother Rebecca, from Hackney, east London said: 'She was really unwell and was being sick and couldn't keep her food down. She also kept having really bad headaches and my sister was worried out of her mind so she took her to hospital. Teenager: Olivia's symptoms were downgraded by a nurse at the hospital, before a doctor misdiagnosed her with suffering from dehydration Apology: The hospital has now apologised to the family and told them the nurse who downgraded Olivia's symptoms has 'since undergone full training' Olivia told the doctor it did not feel like an ordinary headache but the doctor said there was nothing wrong with her. She wasn't even given a scan. 'When she went back to school she was slurring her words, couldn't walk properly and there was something wrong with her eyes. After she got to hospital the right side of her body shut down. 'They thought she was having a stroke, she couldn't walk or swallow properly.' Promise: Olivia's uncle said he promised his neice he would get her 'justice for the mistakes' In his letter to the family Tony Spotswood, chief executive of Bournemouth Hospital, explained the nurse gave Olivia a triage score of four when it should have been two to signal a high-priority patient. He said: 'The triage score of four was not appropriate. We accept that we got this wrong and that Olivia should have had a higher priority to be seen by a doctor. The triage nurse concerned has since undergone full training in triage assessment. I apologise that the triage was not correctly completed. I can only apologise for the delay in Olivia being seen. The department was full of extremely sick patients, especially in the resuscitation area, but she should have been seen more quickly. Olivia's family had previously complained to the Parliamentary and Health Service Ombudsman over the treatment she received at Bournemouth Hospital. In January Ombudsman assessor Gwen Bramwell said: 'We are concerned about the appropriateness of the triage score of four. 'We are also concerned about the locum doctor's decision to discharge Olivia without arranging for further investigations to be carried out.' Olivia's uncle Darren Wicks said: 'We are now a family in mourning. We have yet to get a satisfactory response from Bournemouth Hospital despite the Ombudsman not being happy with the feedback from the hospital. I promised Olivia before she passed away that I would get her justice for the mistakes, and I will.