Atlanta ( CNN ) Almost three weeks after she was found unresponsive in a bathtub , Bobbi Kristina Brown is still fighting for her life . Doctors have removed her breathing tube , two sources close to the family told CNN on Thursday , one day after the procedure supposedly took place . Brown , daughter of late singing star Whitney Houston , will now be ventilated through a hole in her throat . `` This is an indication that the patient will need this for weeks and months to come , as opposed to hours and days , '' said CNN 's chief medical correspondent Dr. Sanjay Gupta . He said the move lowers the risk of infection and is standard procedure . Brown , 21 , remains in a medically induced coma at Emory University Hospital in Atlanta . Doctors are attempting to slowly lift her coma , according to sources close to the family . The extent of her injuries is not known . Police have said they 're treating Brown 's case as a criminal investigation . She was found in a bathtub full of water on January 31 at her Roswell , Georgia , residence . Her mother , who died in 2012 , was similarly found in a bathtub , just hours before she was to attend a pre-Grammy Awards party . A coroner ruled Houston 's death an accidental drowning , with heart disease and cocaine use listed as contributing factors . Brown is her only child . CNN 's MaryLynn Ryan , Sunny Hostin and Carolyn Sung contributed to this report .
Brown , daughter of late singing star Whitney Houston , will now be ventilated through a hole in her throat . The singer was rushed to the hospital on Monday after suffering from an allergic reaction to medication she had been taking for bronchitis.