A Pennsylvania woman convicted of poisoning her son's girlfriend with antifreeze is seeking a new trial, saying her trial attorney was ineffective.

Eighty-four-year-old Helen Galli was sentenced in October 2013 to 5 1/2 to 12 years in prison. A Luzerne County jury had convicted her of aggravated assault and reckless endangering.

Galli is from a borough called Wyoming. Prosecutors say she gave the girlfriend poisoned juice in 2010 because she didn't want the girlfriend getting between her and her son, who'd just signed a million-dollar natural gas lease. The girlfriend was hospitalized for weeks.

Galli's attorney argued Wednesday her trial attorney failed to object to a hearsay statement establishing a link between her and the drink. A Superior Court panel earlier called the statement irrelevant to the weight of the evidence.