A mother will be tried on charges of helping her 14-year-old son build up a stash of weapons that authorities say he intended to use in a school attack.

Michele Cossey, 46, was ordered Thursday to stand trial on charges of endangering the welfare of a child, unlawful transfer of a firearm, possession of a firearm by a minor and two misdemeanors. A third misdemeanor charge was dismissed.

Cossey, of Plymouth Meeting, is accused of illegally buying her home-schooled son, Dillon, a .22-caliber handgun, a .22-caliber rifle and a 9 mm semiautomatic rifle with a laser scope.

Dillon Cossey, who was arrested in October, felt bullied and tried to recruit another boy for a possible attack at Plymouth Whitemarsh High School, authorities said.

Michele Cossey's attorney, Timothy Woodward, tried to have the charges dismissed. He pointed out that no ammunition was found and that minors are allowed to have guns in some circumstances.

"My client's actions may have been misguided but there is no evidence that these actions were malicious or malevolent," Woodward said.

Dillon Cossey is to be sentenced next week. He admitted in court that he planned a Columbine-style attack on the school, which could keep him in juvenile custody for up to 6 1/2 years. The attack never occurred.