Answer: Frou-frou
Frou-frou was the one we were looking for. When Edgar had catnapped the Aristocats once again, the mouse Roquefort warned O'Malley and then the musical alley cats. O'Malley arrived first and was pinned to the wall with a pitchfork, but then every alley cat took hold of Edgar: one on each arm, one on each leg, and one on top of his head. Roquefort unlocked the chest in which the aristocats were trapped, O'Malley trapped Edgar with a headstall, and Frou-frou kicked the devious butler into the chest. A bit later a truck came and shipped Edgar to Timbuktu.
Frou-frou was voiced by Nancy Kulp (1921-1991).
All ended well for the Aristocats, but also for the alley cats: Madame Adelaide adopted Thomas O'Malley and rearranged her last will and testimony so to include all the alley cats. All the characters concluded the movie singing "Everybody Wants to Be a Cat": the alley cats, the Aristocats, Roquefort and Frou-frou, Madame Adelaide and the notary, Amelia and Abigail Gabble and their uncle Waldo, and finally Napoleon and Lafayette - who then had a quip about who was to announce "the end".