Last month, Parentdish reported that Lydia Bishop was thought to have used a 5ft metal slide and then become stuck on the ropes that were part of another piece of equipment at York College Day Nursery – regarded as 'superb' by Ofsted inspectors.
At the time, North Yorkshire Police said they did not believe there were any suspicious circumstances.
But on Monday, two nursery staff were interviewed as part of ongoing inquiries into the circumstances surrounding the tragedy on September 17.
At the inquest which opened on Monday, York coroner Donald Coverdale said a number of children went to play outside some time after 2pm and it was believed that Lydia - whose first day it was at the nursery - wanted to use the slide.
"There came a time when a nursery worker spotted Lydia unresponsive on the slide, and there was a rope which had been attached to play equipment which was around her neck," he said.
"I understand that staff immediately gave what help they could, administering CPR until paramedics arrived."
The coroner said resuscitation attempts continued after the paramedics had taken Lydia to York Hospital, but it proved impossible to revive her, and it was confirmed at 3.27pm that she had died.
A consultant pathologist, Dr Nigel Cooper, later carried out a post mortem examination and said the provisional cause of death was 'pressure on the neck'.
A spokesman for North Yorkshire Police said the workers have been bailed until October 26 pending further inquiries.
He added: "The investigation is still in its early stages and it is not possible to comment further at this time." Police would not comment on the exact charges the two workers were arrested on.
More on Parentdish: Girl, 3, died after becoming entangled in ropes on nursery play equipment