Tragic Sarah Standerwick fell over the railings of a hotel stairwell after jumping out of bed in the middle of the night with suspected hallucinations on her 40th birthday.
Her family say she had earlier attended a boat party with her long-term partner Steve Higgins, 60, and had begun to act wildly out of character.
Sarah, of Queen Camel village in Somerset, who her family say never took drugs or suffered any mental health illness, had earlier happily posed for pictures with as they got on the boat trip in Marmaris.
But her mood quickly changed onboard and she started to display unusual behaviour and told her partner she was “being chased by gremlins.”
The couple went back to their hotel room in the hope she would sleep it off but Sarah woke up, bolted out of the room and ran down the corridor before her fatal fall.
Her devastated family say they are struggling to come to terms with the incident but have spoken out to criticise the British Embassy for what they claim has been a lack of support.
They are looking for help after becoming embroiled in a battle with the Turkish authorities to find out what happened.
The Foreign office said they had given the family advice on how to contact a Turkish solicitor.
But dad Colin, 69, of Dobwalls, Cornwall, said: “We have been left to our own devices and don’t know what we are doing.
“We don’t have any definite answers about what happened to Sarah and we can only make assumptions but her character changed dramatically 36 hours before she died.
“She fell to her death on her 40th birthday while ‘running away from gremlins’ and she was hallucinating.
“What we have been told is that her character changed dramatically overnight. Our grandson had been spiked before and he and she were saying exactly the same things. It was like listening to a tape recorder.
“We think she has definitely been spiked. People might say that this is how we want things to fit but it was so out of character.
“If she was considering taking her own life there was a balcony right outside her room. Why would she run down a long corridor and then fall over the rails of a stair case?
“We want a lot of answers to a lot of questions. Further tests have been done in this country but the body in flight had to be embalmed so that limits what they can do.
“They also apparently did toxicology reports in Turkey but we haven’t been given the results of those.
“All we know is that they went on a boat and got a photo taken at 10am. Then they changed on the boat and she became very silent.
“She felt tired when she got off and they went to a restaurant but she couldn’t handle the music so they went back to the hotel room.
“Three hours later she got up in the middle of the night, ran out the bathroom and that was it.”
Sarah, who worked as a jewellery merchandiser and didn’t have children, had gone on the ten day trip with Steve and another couple to celebrate her birthday in October last year.
Colin added: “We don’t know what went on but she changed dramatically in a few hours. She had no mental health issues and didn’t do drugs. There has to be an explanation of what went on.
“Her partner said if they had been in the UK he would have taken her to the doctor or hospital straight away or called us. But he told her if she was no better in the morning she would get her to a doctor.”
A Foreign & Commonwealth Office spokesperson said: “The Standerwick family have our deepest sympathies at what continues to be a deeply difficult time.
“Our staff have been offering advice and support since Sarah’s death, liaising with the police and coroner’s office and setting out the options available to them, including how to engage a lawyer in Turkey if they wish to do so.”