By Steve Hulett in John Sparey’s “Types I have known”: Bea and Liz:

“Assistant animator Berta “Bea” Tamargo (left) started at Disney in 1946. In 1958, in John’s words, she “spoiled her euphonious name” by getting married and becoming Bea Jones. That same year she was let go in the infamous “Black Friday” mass layoff at the end of Sleeping Beauty, and she appears to have left the business.”

Hans Perk commented on Jenny Lerew’s Women of [Disney] Animation:

“Around July 25th, 1946, Bea Tamargo shared room 1C-1 with Mary Boylan, Tex Henson, Grace Kappler and Carmen Singer.”
 

Sources:

Steve Hulett, John Sparey’s “Types I have known”: Bea and Liz: http://animationguildblog.blogspot.de/2006/10/john-spareys-types-i-have-known-bea.html

Jenny Lerew, Women of [Disney] Animation: http://blackwingdiaries.blogspot.de/2006/10/women-of-disney-animation.html