Vollmer was cast as Bulma in 1999 for FUNimation Entertainment's third season of Dragon Ball Z, replacing Leslie Alexander, who left the franchise after playing Bulma in the film Dragon Ball: Sleeping Princess in Devil's Castle, that was recorded much earlier. Vollmer was part of the cast that replaced the heavily edited dubbing by the Ocean Group of the first two Dragon Ball Z seasons. She has since gone on to voice Bulma for the rest of FUNimation's dubbing of the Dragon Ball franchise, including the original Dragon Ball anime series and the uncut versions of the first two Dragon Ball Z seasons. Vollmer also voiced Bulma in Dragon Ball GT (where Bulma's role, like that of most prior characters in the Dragon Ball franchise, is greatly reduced), 2 Dragon Ball movies, 9 Dragon Ball Z movies, as well as Dragon Ball video games. She was replaced by Monica Rial for Dragon Ball Z Kai, Dragon Ball Z: Battle of Gods and Dragon Ball Z: Resurrection ‘F’. She also voiced a few smaller, additional characters in the Dragon Ball franchise as well. She also held bit parts in Case Closed and Yu Yu Hakusho.
With FUNimation's dubbing of the Dragon Ball franchise largely over, Vollmer has since worked on a couple of live action films, both in front of and behind the camera. She was the associate producer of the half hour short Placebo (2006), co-starring three of her fellow FUNimation VAs Laura Bailey, Meredith McCoy and Mike McFarland. She also worked as actress, key makeup artist, and head of wardrobe on the 2008 film Ciao. She provided makeup and wardrobe for the 2008 film Stalker's Dating Guide. In 2010, Vollmer was the assistant director and art director for the horror film Evidence of a Haunting, released in Fall 2010.
Her other occupations consisted of being a makeup artist and stage actress around the Dallas area. In 2011, she moved to New Orleans, Louisiana, where she works as a film producer.