Antoinette Pelzer, a Philadelphia resident who has often been homeless, is currently being held on bail of $1.5 million.
Police say she killed Po Lin Wan and her daughter Alice Mei See Leung, both from the Scarborough section of Toronto, with a 12-inch butcher knife during a mugging in May.
It will be the second court appearance since Pelzer's arrest. In May, she laughed, frowned, grimaced and asked repeatedly where her lawyer was.
The stabbing took place in the heart of Atlantic City's tourism district - a place where security is emphasized.