Investigators say Catherine Venusto used the Northwestern Lehigh School District superintendent's password to change the grades. She was arraigned Wednesday on a half-dozen felony counts and released on bail.
Officials say Venusto changed a failing grade to a medical exception for her daughter in 2010, when she was still a district secretary. The New Tripoli woman is also accused of bumping one of her son's grades from 98 to 99 percent in February.
State police say Venusto admitted changing the grades, saying she thought her actions were unethical but not illegal.
A phone listing for Venusto could not immediately be located Thursday.