Gertrude said that her daughter had been a happy child, but began to experience bullying in middle school and was suspended multiple times for fighting.
The young girl's sister, Asha Joseph, told PBS: 'We're confused how this could happen. We also want to know why there wasn't anyone there at the moment, why there was nobody watching her and how she was able to leave.
'We don't really know anything. We don't have any of the answers.'

A GoFundMe launched by the girl's her family states: 'It's tragic that her potential was cut short due to lack of care. An act of negligence led to her passing and were left with so many questions.'
It added that Niyimbona was a 'shining light, a bright angel who lit up our lives with her presence.'
'Sarah was intelligent, independent and outspoken, with a unique perspective on life that was truly magical,' her sister, Joseph, added. 'Her selflessness and compassion touched the hearts of everyone she met, from family and friends to peers and teachers.'
'It's heartbreaking that the one place that was supposed to keep her safe failed to do so.'
The girls' mother said that her daughter had been a happy child, but began to experience bullying in middle school and was suspended multiple times for fighting
Niyimbona's tragic death led file a lawsuit against the hospital over accusations of neglect and medical malpractice
The hospital said in a statement to the Spokesman-Review: 'We are heartbroken about the tragedy that occurred at Sacred Heart Medical Center. Safe, compassionate care is always our top priority.

'We believe that Sacred Heart Medical Center provides compassionate and thoughtful care to our patients in alignment with our mission and values. We extend our deepest sympathy to the patient's loved ones.'