Trina Meisel was arrested in May after her two daughters, ages 12 and 6, disappeared during recess from a school near Vulcan, Alta.
The girls were found about a week later in British Columbia unharmed after police issued an Amber Alert.
Meisel's lawyer has stated in court that she is prepared to plead guilty once a statement of facts is agreed upon.
But the judge in the case has accepted the Crown's application to hold a hearing to assess if she was criminally responsible.
Meisel is to return to Lethbridge court Sept. 12 to set a date for the hearing. (CJOC)