She was born or married into the wealthy Snow family were she presumably gained much of their wealth and privilege after the death of her husband. She had at least 2 children, one of them being Crassus Xanthos Snow and her other child being the father or mother of Tigris.
In the first year of the First Rebellion, she would play the anthem on national holidays for Coriolanus, five years-old at the time, and his cousin Tigris, eight-years-old at the time, in order to build their patriotism. When the Capitol was under siege, she would tell them "Remember, children, we are but besieged. We have not surrendered," then warble the anthem as bombs rained down around their apartment. She could not cook, but often threatened to learn to do so. She had a saying regarding Avoxes that "tongueless workers make the best workers." Though, Coriolanus loved her, he felt she had lost touch with reality a long time ago. Even when the Snow family was deep in poverty, she often began her sentences with the phrase "When Coriolanus is President..."
She grew roses in a rooftop garden. She was very possessive of them, but was sometimes willing to part with them if it would help her grandson.
As the Snow financial situation continued to worsen, she began to descend into denial and eventually despair. When her grandson was made to enroll in the Peacekeepers and shipped to District 12, she did not quite seem to know what was going on and twice asked Tigris when he would be home and if they should wait on dinner. Her condition improved greatly after the Plinths arranged to buy the flat the family was living in and came to an arrangement so that the Snows could continue living there. The Plinths paid for everything, ending the Snow family's financial worries, though the Grandma'am had to resign herself to having a new "maid" in the form of Mrs. Plinth, who came by every day to help.
- She outlived all her known children, Xanthos and another unknown child who was Tigris' parent.
- When a recording of the Capitol, "Gem of Panem" starts playing, she starts singing along in a tremulous soprano voice. She is badly off-key and slightly behind the song's tempo.
- The Ballad of Songbirds and Snakes, Chapter 1
- The Ballad of Songbirds and Snakes, Chapter 21
- The Ballad of Songbirds and Snakes, Chapter 30