The inquest was told that the call to the emergency services was made at 19:52 GMT by a girl who was at the scene.
In a transcript read at court, she told a call handler from the NHS East of England Ambulance Service, Daniel Joym, that Cole-Nottage was trapped and screaming.
She was instructed not to attempt to rescue her but, after nearly seven minutes, she informed the call handler that Cole-Nottage was in the water, and it was rising.
“She’s going to drown,” she said.
It was at this point that the emergency was changed from entrapment to drowning.
About five minutes later, the girl asked, “can they come quickly? I think she has died”, before paramedics arrived about 18 minutes later.