Was she the one who Elvira for ripping off her character?
Yes, from WIKI:
In 1981, Nurmi was asked by KHJ-TV to revive her Vampira character for television. She worked closely with the producers of the new show and was to get an executive producer credit, but Nurmi eventually left the project over creative differences. According to Nurmi this was because the station cast comedic actress Cassandra Peterson in the part without consulting her. “They eventually called me in to sign a contract and she was there,” Nurmi told Bizarre magazine in 2005. “They had hired her without asking me.”[7]
The show was abruptly renamed Elvira’s Movie Macabre with Peterson playing the ghoulish titular host. Nurmi soon filed a lawsuit against Peterson. The court eventually ruled in favor of Peterson, holding that “’likeness’ means actual representation of another person’s appearance, and not simply close resemblance.” Peterson claimed that Elvira was nothing like Vampira aside from the basic design of the black dress and black hair; Nurmi claimed that the entire Elvira persona, which included comedic dialogue and intentionally bad graveyard puns, infringed on her creation’s “distinctive dark dress, horror movie props, and...special personality.”[8] Nurmi herself claimed that Vampira’s image was in part based on the Charles Addams The New Yorker cartoon character “Morticia Addams”, though she told Boxoffice magazine in 1994 that she had intentionally deviated from Addams’ mute and flat-chested creation, making her own TV character “campier and sexier” to avoid plagiarizing Addams’ idea.[9]