I am very confused by the Allenham issue. If Mrs. Smith was "at home", why would it be more scandalous (sp) for Mairanne to go there then for Willoughby to stay with the Dashwoods. Is it because Marianne has not been introduced to Mrs. Smith, or because Willoughby is visiting?

I must have missed something here because this entire incident has escaped me. Would someone please help to enlighten me?