The teenage daughter of former Premier League star Antoine Sibierski hanged herself after drinking champagne and taking the recently banned drug mephedrone, an inquest heard.
Sibylle Sibierski, 18, was described as a regular user of the drug, which was made illegal in April this year after its link to a number of deaths.
Stockport Coroner's Court heard that Miss Sibierski, a student who liked to party and smoke cannabis, was also deeply insecure and "paranoid".
She had rowed with her boyfriend the night before she died. Police were called and she was arrested.
The inquest also heard that users of mephedrone, also known as Miaow Miaow or Bubbles, often suffer low moods after taking the drug. It also affects their ability to think about the consequences of their actions.
Her French father held her mother's hand as she wept during the proceedings.
Friends told the court of the teenager's regular use of mephedrone which she bought, then legally, for £25 a gram every weekend from a "herbal shop" near her home in Altrincham, Cheshire.
Miss Sibierski was found hanged when police broke into her flat on February 1 this year after friends and family were unable to contact her.
Joanne Kearsley, Deputy Coroner for South Manchester, recorded a narrative verdict following the two-hour hearing.
Addressing Miss Sibierski's parents, she said: "I suspect this may have been an impulsive act, perhaps driven by her low mood."