A Missouri mother should serve three years in prison for her role in a MySpace hoax on a 13-year-old neighbor who committed suicide, federal prosecutors said in court documents filed Wednesday.

Assistant U.S. Attorney Mark Krause outlined the government's position while requesting the maximum sentence for Lori Drew. Probation officials have recommended Drew receive a year of probation and a $5,000 fine.

Krause argued that Drew "coldly conceived of a scheme to humiliate" Megan Meier, a neighbor in a St. Louis suburb, by helping create a fictitious teenage boy on the social networking site and sending flirtatious messages in his name to the girl.

The fake boy then dumped Megan in a message saying the world would be better without her. She hanged herself a short time later.

Drew used her then-13-year-old daughter and a business assistant in the scheme, which played on Megan's insecurities, Krause said.

"Both the callousness of defendant's criminal conduct and the extraordinary harm it caused mandate a sentence of more than probation," Krause wrote.

Drew was convicted in November of three counts of accessing computers without authorization. Besides up to three years in prison, she could face a $300,000 fine at sentencing set for May 18.

Drew's attorney, Dean Steward, has asked U.S. District Court Judge