Mrs. Dinkley looks like a more mature version of Velma.
Mrs. Dinkley encouraged Velma's academic progress. She and her husband are very proud of Velma.
A Pup Named Scooby-Doo
In "The Computer Walks Among Us", Mrs. Dinkley was relieved when Velma and her friends cleared her of being behind the Dinkley 2000, the rogue computer that was attacking the school.
While wrapping up a mystery, Velma received a call from her mother, telling her to check up on her younger sister, Madelyn, at Whirlen Merlin's Academy of Magic.