Félicité Tomlinson, 18, collapsed from a suspected heart attack at her studio apartment in Earl’s Court in March.
Westminster coroner’s court inquest heard the teenager, originally from Doncaster, fell into depression and started abusing drugs following her mother’s death from leukaemia in 2016.
She was found “lifeless” in bed by schoolfriend Zainab Mohammed after they had bought and taken cocaine the night before, the hearing was told.
Ms Mohammed initially denied taking drugs but later admitted to police that she found her friend with her “lips whiteish” shortly after noon and called a friend who told her to dial 999.
Recording a misadventure verdict, coroner Dr Shirley Radcliffe said: “It was a perfect storm, the OxyCodone, the alpraxolam and cocaine. I find no evidence this was a deliberate act to end her life.”
Ms Tomlinson regularly shared posts with her 1.3 million followers on Instagram. A tribute by her father Mark was read out at the hearing, in which he said she “had huge hopes and aspirations”.