Miss Reichenbach is supposedly the maid of Dorian Wormwood the retired stage actor. Actually, she is Wormwood in disguise.
She has her white hair in a bun.
She cheerfully brings sandwiches for the gang.
Scooby-Doo, Where Are You? (DC Comics)
The fact that the name 'Reichenbach' is like Reichenbach Falls, where Sherlock Holmes was thought to have fallen to his death, is no coincidence. All the names were picked for associations with Holmes, as clues.