Sylvia Sieferman now is charged with one count of first-degree attempted murder in the attack on her daughter, Linnea, on Aug. 21.
Last week, Ramsey County prosecutors charged her with one count of attempted second-degree murder in the attack on her daughter, Hannah.
Both girls are 11 years old. Sieferman adopted them from China.
The 60-year-old Sieferman also seriously injured herself and remains hospitalized, as are the girls.
Friends said Sieferman has had a string of bad luck in recent years, including financial pressures. She was hospitalized in a psychiatric unit about a month ago.
According to the criminal complaint, Sieferman told police she had hoped to kill her daughters quickly so they wouldn't have to endure her "screw-ups" any longer. She said no one believes her or likes her anymore, and she has no friends and no work colleagues.

