Brooke Skylar Richardson's attorneys filed a motion arguing that if the 20-year-old is tried together on all five charges against her it could prejudice the jury.
Authorities say that after Kelly May Algar and her companion ended up in the hospital, she told hospital workers she had to leave the medical facility to go home and check on her child, leading deputies to discover the toddler completely alone.
Courtney Irby was arrested after she went into her estranged husband's apartment and took two firearms, which she later turned over to police, telling officers that she feared for her life.
In the months before his arrest, Gurpreet Singh had said he was waiting for "justice" in the slayings but investigators believe he was the one responsible for the crimes.
Authorities were called to a California cornfield after Sherri Renee Telnnas had reportedly been acting "strangely" and discovered her two sons, ages 12 and 7, unresponsive in an irrigation ditch.