Lisa Turkki of East Syracuse was arraigned Tuesday on an attempted-murder indictment. She is accused of using kitchen knives to slash the 7- and 9-year-old girls while she was baby-sitting at their Katonah home on July 31.
The 40-year-old Turkki pleaded not guilty. Her lawyer said she plans a psychiatric defense.
Along with the indictment, prosecutors filed several statements Turkki allegedly made to police on the night of the stabbings.
They say Turkki told police she didn't know why she stabbed the girls and she was sorry for what she had done to her sister, the girls' mother.
The girls recovered from their wounds.