Toxicology tests are now being carried out in an effort to identify the exact cause of death.
17-year-old Tory Johnston died just before 7am yesterday at Letterkenny General Hospital after suffering a suspected heart attack.
She had been taken earlier from a local nightclub in the town after falling ill.
Meanwhile the funeral arrangements for Tory Johnston have been released. Her remains will be removed from The Eternal Light Chapel of Rest at 8pm this evening going to her home.
Her funeral will take place on Sunday afternoon at 2pm.