A mother accused of deliberately injecting her 4-month-old son with salt water will be sent to a state mental hospital because she suffers from severe depression.

Amber Brewington, 21, of Duck River, Tenn. was charged last week with attempted homicide for trying to poison her son at a city hospital by injecting a saltwater solution into his feeding tube, police said.

According to a police affidavit, Brewington was trying to speed up the boy’s death to end his suffering. The boy, Noah King, was admitted in Columbia, Tenn., in May and was later transferred to Vanderbilt University Medical Center because he suffered unexplained seizures and possible brain damage. He was in critical condition with sodium poisoning at Children Hospital of Pittsburgh on Wednesday. He had one of the highest recorded levels of sodium, even for an adult, when being admitted in the hospital.

Brewington “gave her infant son four to five full syringes of high volume salt water in attempts to speed up his death. Amber felt that she did not wish to see her son suffer,” the affidavit read.

On Thursday, Allegheny County Judge Jeffrey Manning ordered that Brewington be sent to Mayview State Hospital for no more than 90 days.

The decision came after Psychiatrist Christine Martone testified that the woman needs to be tested for Munchausen by Proxy syndrome, in which a caregiver fakes or induces illness in others to generate sympathy. Martone also added that Brewington has a borderline personality disorder and admits to having suicidal thoughts.