"They made a decision to sleep it off..."
The young women were reportedly found by shocked staff who rushed them to Kampot provincial hospital, but they could not be revived.
Pictures on her Instagram showed her on trips to the islands of Bali and Gili Trawangan in Indonesia.
Soon after, police visited Ms Bowler at her home in Shefford, Bedfordshire, to tell her that her daughter had died.
"I don't know if they'll want an autopsy to determine cause of death, because nobody knows".
She posted a picture just three days ago of a boat trip off the Cambodian coast.
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"We found pills for headaches and dizziness at the scene", he said. Local reports suggested they had already passed away when found in the hostel.
"It was definitely not murder because we did not find any marks or bruises on their bodies".
The officer said food poisoning leading to an overdose was the most likely cause of death, but no tests had been carried out on the food in the girls' stomachs.
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A member of the management of the Monkey Republic Hostel told MailOnline: 'We are all deeply shocked and very sad for the families and friends of these two very nice women. "They arrived together and went around together", Monkey Republic hostel spokesman told the Daily Mail.
"This is now in the hands of the police but there is nothing suspicious about their deaths", the manager said. "Everyone is very upset about it".
A spokesperson from the Foreign & Commonwealth Office said: "We are supporting the family of a British woman who has died in Cambodia, and are in contact with the local authorities investigating her death".
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The British Embassy in Cambodia were approached for comment.