Texas ? A woman accused of killing her 10-month-old daughter by cutting off the baby’s arms with a kitchen knife went on trial Monday after pleading not guilty by reason of insanity.

Police found Dena Schlosser, 37, covered in blood in her kitchen, still holding a knife and listening to a church hymn.

During opening statements, her attorney, William Schultz said Schlosser clearly did not know right from wrong during the November 2004 slaying of baby Margaret.

Prosecutor Curtis Howard disagreed, saying that while Schlosser obviously had mental problems, she did know right from wrong when she killed her daughter.

Schlosser was diagnosed with manic depression after her arrest. In February 2005, a jury deliberated only a few minutes before deciding Schlosser was mentally incompetent to stand trial and she was committed to North Texas State Hospital in Vernon. But in May, a judge decided Schlosser was competent.