She first appears in "Mommies Dearest" where she and the other spies' moms go with their daughters to a spa facility, but become brainwashed to attack the girls. She then appears in "Zooney World" where she takes care of her nephew Norman and grounds Clover.
In "Totally Busted", she comes home from Europe, along with Samantha and Alexandra's mothers Gabriella and Carmen, where they find out that their daughters are undercover super spies for WOOHP. Feeling that it is not something a "proper lady" should do, Stella and the other moms force the girls to quit. They are later kidnapped by Mandy, Dominique, and Caitlin at The Groove after the latter were turned into spy-ssassins because of the SUDS. When the daughters rescue them and get captured in their place, Stella and the moms turn to Jerry to become spies, in which Stella's Catsuit was hot pink, and are able to save their daughters. At the end of the episode, she and the moms become official WOOHP spies.
Clover's father was mentioned in "Evil G.L.A.D.I.S. Much?" and "Evil Valentine's Day" by Clover. It can be assumed that he and Stella are married since he sent Clover numerous Christmas gifts from Europe. In "Zero to Hero", Clover mentions that she has a nephew, so she may have an older sibling(s) who has children of their own.
Stella also made a cameo appearance in "Totally Spies! The Movie".
Stella makes an appearance in the Season 6 episode, "Nine Lives", in which Clover tries convincing her mom that she is studying to become a doctor rather than a fashion designer while she is at Malibu University. Clover states that Stella is a successful earlobe contouring surgeon. After Feline Dion was arrested in her hypnotized state, Clover finally admits to her mother that she wanted to become a fashion designer rather than being a doctor like she is. Stella calmly accepts her daughter's course and her dreams to become a fashion designer which makes Clover hugs her.
- "Halloween" (she calls Clover)
- "Mommies Dearest"
- "Nine Lives"
- "Totally Busted"
- "Totally Spies! The Movie"
- "Zooney World"
- In "Totally Busted" and "Nine Lives" Stella's voice is much deeper than Clover's. As a contrast to Phoebe's voice who is slightly deeper than Mandy's. Both Stella and Clover are voiced by the same actress.
- In "Mommies Dearest" she says that she had bought her swimsuit on her honeymoon in the 1970's.