Mother Brightly took over the Rithmere Games after the previous owner, Fardeep, was driven away from Rithmere on the Shadow Lord's orders. As the new leader of the games, she changed their original design to be more like gladiatorial matches where contestants would fight one another in brutal single-combat, often to near death, for the chance at 100 gold coins it they were a finalist, and 1000 gold coins if they were champion.
In actuality, the games were a trap set by the Shadow Lord to find new gladiators to fight in the Shadow Arena. After the games were over, the champion and all finalists were captured and brought to the Shadowlands. Mother Brightly would then spin rumours that the combatants ran off with their money to live in secrecy.
On the eve of the 11th Rithmere Games, Lief, Barda, and Jasmine came to the Champion inn to resister for the games in the hopes of winning money for their quest. Mother Brightly was more than happy to register them in—under the false names of Twig, Berry, and Birdie of Bushtown respectively—before confiscating their weapons for the duration of the games. She then explained the rules to the companions and gave them their room key.
The next day, on her way to the games, Mother Brightly spotted one of her bed sheets hanging from a window in the Champion Inn. She unlocked the room to discover Lief, Barda, and Jasmine locked inside after an attempt by Doom to keep them from the competition. She escorted the companions to the arena so that they could participate in the preliminary rounds, which she watched from a private booth in the stands. That night, she collected all of the participant's room keys so that there would not be another mishap.
Due to Dain serving Glock and Neridah drugged Queen Bee Cider, the champion match between Jasmine and Doom was moved forward a day. Mother Brightly watched the match and later congratulated Jasmine's victory while presenting her, Lief, and Barda with their winnings. Afterwards, she offered to let the companions leave the Champion Inn through a back door so they could avoid muggers. However, this was just a rouse and the three were knocked out by Grey Guards.
At some point after Lief was crowned as the king of Deltora, Fardeep retook possession of the The Champion Inn and the Rithmere Games from Mother Brightly. What happened to her afterwards is unknown.