Henrietta, N.Y. - Dawn Nguyen pleaded not guilty today in Henrietta Town Court Tuesday.
She is accused of lying on a written form when she bought a shotgun and a semi-automatic rifle in 2010.
Nguyen is facing federal and state charges.
Police say Nguyen bought the weapons for Lake Road shooter William Spengler. She was arrested just days after the ambush on Lake Road in which two volunteer firefighters lost their lives and two others were injured.
Police say Spengler used the weapons Nguyen bought on Christmas Eve.
Webster Police Chief Gerald Pickering says Spengler fired off nearly 60 rounds and was found with hundreds of rounds of ammunition.
Nguyen's case has been waived to a grand jury.
She is free on bail and can only leave Monroe County to attend college classes.