Sarah Joy Lomaintewa, 29, pleaded guilty at an earlier hearing to threatening a school official.
As part of her sentence, the defendant can be released to a drug/mental health treatment program after 180 days, said Deputy District Attorney Daniel Shim. Lomaintewa was also ordered to stay away from schools.
The threats were reported shortly after noon on March 5, prompting administrators to institute lockdowns at Lindo Park Elementary, Tierra del Sol Middle School and El Capitan High School while deputies searched for the perpetrator, sheriff's Lt. George Calderon said.
Within 90 minutes, the security measures were lifted, and students were bused to a nearby commercial parking lot to be picked up by their parents.
Shortly before 4 that afternoon, deputies arrested Lomaintewa in the area of Ashwood and Mapleview streets, near the south end of the high school, Calderon said.
According to a probation report, the defendant told her brother that she was going to “shoot up a school,'' said Deputy District Attorney Daniel Shim.
Shim said Lomaintewa's mother has custody of the defendant's children.