Margaret is considered unpopular to most people in Mackrel Middle School. She is a big-time pencil chewer, according to Jamie. Usually, Jamie sarcasticly shows pictures of Magaret eating pencils. She's very goofy and "uglyish" like Isabella said, in Book 2, My Pants are Haunted. Also in that same book, Isabella and Jamie give Margaret a massive makeover which gives her popularity points, but for some reason she throws it all away.
Margaret has never been to the mall and wears "ugly old clothes". She is apparently even weirder and goofier than she seems.