SHEBOYGAN, Wis. -

A 76-year-old Sheboygan woman must undergo an evaluation to see if she's competent to stand trial on charges that she killed her infant daughter 55 years ago.

Ruby Klokow has pleaded not guilty to second-degree murder in the death of her 7-month-old girl in 1957.

The charge was filed after Klokow's son came forward to police in 2008 with stories of childhood abuse.

James Klokow told police his mother regularly beat him, choked him and kicked him in the legs with steel-toed boots so often that he still has knee problems. He also spoke of his mother breaking his arm and nose.

The complaint said police then went to Klokow, who allegedly admitted causing the infant's death.

A judge on Tuesday granted her attorney's request for an evaluation.

Prosecutor Joe DeCecco said the defense attorney didn't raise concerns about Klokow's memory so much as her ability to stay focused on specific questions. DeCecco said the concern is whether she's competent to assist in her own defense.

A message left for defense attorney Kirk Obear was not immediately returned.

A trial was to begin Sept. 10, but it will be pushed back pending the results of the competency test.