Who is the Carmen Lowell in Girls in Pants: The Third Summer of the Sisterhood by Ann Brashares?

Carmen is one the main characters in Pants: The Third Summer of the Sisterhood. She is impetuous, reckless, often getting into trouble for doing things without thinking. Her mother's remarriage changes their relationship, and as a result, Carmen is very uncomfortable with the fact she feels like she is losing her mom to David,