Having been unsuccessful in losing weight, as her career progressed, she embraced her figure and found a niche in roles of overweight characters.

As well as several films, her work also spanned various television series, including The Addams Family, McHale's Navy and To Rome with Love.

[6] During filming of a scene in Who's Minding the Store?, where Mondo played a heavy wrestler, she was required leap over a sales counter onto a prosthetic dummy of co-star Jerry Lewis, however she nearly fell on top of him as he did not move away quickly enough.

Mondo, who reportedly weighed 200 pounds (91 kg) at the time, appeared larger than usual due to wearing knee pads and additional protective gear.

Contrary to her belief that overweight actresses attempted to disguise their figure, she embraced bright dresses, including sometimes wearing more than one at once.

[10] She was a regular cast member in the 1969 sitcom To Rome with Love,[8] where she played the role of an Italian landlady Mama Vitale.