A Queensland teenager badly burnt when a boy poured accelerant on a fire at a party is suing a mother for $11.8m, alleging she failed to properly supervise the gathering.

Paris Turkington, then 16, suffered third-degree burns to 42% of her body when she was engulfed by flame during the party at a Toowoomba house in August 2013.

She has extreme facial scarring and still wears a whole body pressure garment for 23 hours a day.

Turkington is suing the woman whose son invited her to the party alleging she failed to supervise, or adequately supervise, the gathering where most attendees were 15 or 16.

It is alleged youths threw accelerant, either kerosene or methylated sprits, on to a brazier fire numerous times during the party before the incident that left the teenager severely burnt.

Her personal injury claim alleges her mother, Phoebe Turkington, had asked the woman whether she needed any help supervising the teens but was told a male friend would be coming over to help.

“In truth, and in fact, at no time during the duration of the gathering was any adult present to act in a supervisory capacity other than the defendant herself,” the supreme court claim states.

Turkington was burnt by a “sheet of flame” when a 15-year-old boy, who was not invited to the party, poured accelerant from a bottle on to the fire.

She spent 33 days in an induced coma, time in intensive care and burns units, and underwent numerous surgeries.

Turkington’s lawyer, Jillian Barrett, of Maurice Blackburn, described the injuries as horrific.

“Her injuries are excruciating and she’ll never fully recover,” she said.

“It is a significant claim but it’s for a lifetime of treatment and a career cut short before it even began.”

Barrett said the defendant’s home and contents insurance should be able to be used to fund her client’s claim as premiums protected people invited into the home.

She said the case should serve as a warning to parents hosting parties for young people.

“What happened to Paris could have been prevented if the party was properly supervised and she will suffer as a consequence for the rest of her life,” she said.