Kelsey was an apparent neighbor of Maria, as she approached Jackson because she noticed the moving vans. Almost immediately after meeting Maria, she suggested they go into town on the free Bubble Shock! bus. The ride was only free, however, because it made a mandatory stop at the Bubble Shock factory. She and Maria got embroiled in the mysterious happenings at the factory, and soon met The Archetype, who would later come to be known as Luke Smith. She herself was briefly held prisoner by Mrs. Wormwood and used for her knowledge of Sarah Jane Smith.
Although she would thrust her way into Sarah Jane's attic, and met K-9, she was not involved with the final remedy to the Bane crisis, because she was under the influence of the Bane chemical.
After having been released from the influence of the Bane, she was later described by Maria as "backtracking like mad — saying there's no such thing as aliens".