Severely depressed and mentally ill, she began hearing voices and hallucinating.
She allegedly saw "Satan" who instructed her to kill her employer's 16-year-old daughter.
So Indonesian maid Tuti Aeliyah stabbed Shameera Basha four times with a knife before strangling the girl to death with her school uniform.
Yesterday, Tuti, 30, was sentenced to 12 years' jail for culpable homicide not amounting to murder for killing the Secondary 4 student from Tanjong Katong Girls' School at her Tampines HDB flat on Nov 14, 2013.
Court papers said Tuti began working for Shameera's family in April 2012.
Things went smoothly until a few months before November 2013.
That was when Tuti began to act differently.
She stopped eating properly, lost weight and refused to phone home.
She also would not respond to her employer's attempts to counsel or speak to her.
Two weeks before the incident, Tuti told a neighbour's maid that she wanted to end her life.
While she did not explain her reasons, she was observed to be sad and looking blank.
On the morning of Nov 14, 2013, Shameera's parents and brother left the flat.
It was at this time that Tuti said she saw "Satan" in a mirror.
At about 8am, she took a knife from the kitchen drawer and entered the bedroom where Shameera was asleep.
She then took a pillow and tried to smother the girl.
A struggle ensued and Tuti stabbed Shameera's chest and abdomen more than four times with the knife.
Shameera became weak, fell off the bed and onto the floor.
Tuti then took the girl's dark green school pinafore and looped it around the teen's neck a few times before pulling hard on both ends. She only released her grip after Shameera stopped moving.
Tuti then left the bedroom and went back to the kitchen, where she drank half a cup of fabric softener and cut her wrist using a knife.
She also tried to hang herself using a cloth in the kitchen toilet but backed out as it was too painful.