Holly Heartworm is an actress.
Scooby-Doo! (DC Comics)
She was a one-week guest star with the gang. They tried to get her involved in capturing the Zebra Monster. All she had to do was pull a lever at the right time, but at the last minute she decided the Zebra's stripes would clash with the polka-dotted dress she was wearing, in the post-capture photo. So she ran off to change, leaving the gang to fight the monster alone. She still got the publicity and credit, just as her publicist Preston Pressman planned.