Really not much is known about Myriam apart from the fact that she was the grandmother of the now-deceased CCN news reporter, Rachel Priest.
Events of Criminal Case
After Rachel was murdered, Carl Ackerman, Rachel's cameraman, requested the team's help in the Additional Investigation of Rachel's gruesome murder case. Carl asked the team to find Myriam's lost phone number (which he had written in a notepad) so that he could call and ask her to fetch Rachel's CCN prize of "CCN Best Reporter". The team then searched the Grim News Headquarters and found the notepad, and finally gave it to Carl, who was relieved as he wanted Rachel's prize to end up with her family. The team felt Carl did the right thing after he had wrongly sold out Rachel to Alden Greene (as revealed earlier in the case), feeling that Rachel could finally get the recognition and respect she deserved.