Maurlene

Maurlene is Grandpa's girlfriend and only appeared in the online version of Diary of a Wimpy Kid. She was replaced by Darlene in Hard Luck. She owns a pair of leopard-print women's underwear that she accidentally left at Greg's house when watching him and his brothers. When Susan found the pair in the laundry, it caused her to think that Frank may have been having an affair with another woman. However, when Maurlene came over for dinner with Greg's grandpa and saw the underwear, she revealed that they were hers.

Trivia

 * She slightly resembles Isabella from the The Ugly Truth.