This strip marks the beginning of a strange theme, Violet's fascination with making mud pies. The "pardon my fingers" comment is a nice touch.
By the way, I just noticed that none of the other characters, besides Snoopy, have met Violet yet. Patty and Shermy have yet to see her.
The book Schulz and Peanuts: A Biography by David Michaelis observes that most of the characters in Peanuts had analogues in people from Schulz's life. While this is an appealing explanation to me, I wonder how accurate it is. While I think an artist ultimately takes everything he creates from his life in some fashion, I'd say that sources are often heavily obfuscated.
The book notes that the name "Van Pelt," the last name of Lucy and Linus, was taken from some real-life friends of Charles and Joyce Schulz. The name of the two Patties, both vanilla and "Peppermint" varieties, come from the same person, a cousin of Charles Schulz, with the later character being closer to the actual person.
Schulz often picked unusual names for characters: Linus. Marcie. 5. Eudora. Woodstock.