10/21/2013 10:39 EDT | Updated 12/21/2013 05:12 EST

Mother accused of killing three children in court

DRUMMONDVILLE, Que. - A Quebec mother charged with killing her three children is back in court for a preliminary hearing.

Sonia Blanchette faces three counts of first-degree murder as the next step in her criminal case begins today.

Her three children — Lorelie, age 5, Loic, 4, and Anais, 2 — were found dead in their mother's apartment on Dec. 2, 2012.

Last January, a judge ruled that Blanchette was fit to stand trial after she underwent a psychiatric evaluation.

The coroner ruled the two youngest children drowned while the oldest child was killed by a combination of strangling and drowning.

Toxicology reports reveal none of the children had drugs in their system.

A preliminary hearing is for a judge to determine whether there is enough evidence to send the case to trial.

The hearing is under a publication ban.