Lawyer Jill Witkin, who represents the coroner, says Elva Bottineau called her from prison last week to say she wished to seek standing at the inquest.
Bottineau and her partner Norman Kidman are currently serving life sentences for second-degree murder in Jeffrey Baldwin's death 11 years ago.
Lawyer Owen Wigderson says his firm will meet with Bottineau today to see if it will represent her in the proceedings.
Wigderson asked the inquest to postpone further testimony by Jeffrey's children's aid worker until the matter was dealt with because whoever represents Bottineau would have to cross-examine the caseworker.
Lawyers for Jeffrey's surviving siblings and the office of Ontario's advocate for children and youth say they will oppose
Bottineau's request, arguing it would only delay the inquest and serve as a soapbox for a convicted killer.