Charles Schultz wrote The Peanuts as a work of children's literature. Marcie and Peppermint Patty are essentially (perpetually) ten years old. There is no evidence, hard or implied, that there is any sort of relationship between Marcie and Patty other than friendship. Short answer, no.
Peppermint Patty's best friend's name is Marcie. They are often seen together in the Peanuts comic strip created by Charles Schulz.
Patricia "Peppermint Patty" Reichardt and sometimes Marcie .
Marcie often referred to Charlie Brown as "Charles."
Peppermint Patty's closest friend is Marcie.
Charles M. Schulz the creator of the "Peanuts" comic strip .
Peppermint Patty's first guest was Snoopy in the Peanuts comic strip. She invited him over to her house for Thanksgiving dinner, but he ended up cooking a large meal in his own unique way.
Sir.
Peppermint Patty invites herself and a few friends to Charlie Brown's house for Thanksgiving dinner in the classic Peanuts comic strip. She is known for her bold and assertive personality.
Because it just silly enough to be funny.
According to Charles Schulz, no she was not. It is fairly obvious that she has a crush on Charlie Brown, whom she called "Chuck." The female whom she is often paired with, Marcie, also has a crush on Charlie Brown.
Some of Charlie Brown's friends include Linus, Lucy, Sally, Schroeder, Peppermint Patty, and Marcie.