Margaret Collins is one of the pre-made gypsy matchmakers in Downtown from The Sims 2: Nightlife. The other two pre-made gypsy matchmakers are Lakshmi Wilson and Amy Pai. She is added once Downtown is associated with the main neighborhood. Margaret can be made playable by befriending and asking her to move in, or by marrying her.
She has the same facial structure as Marsha Bruenig from Pleasantview. Margaret's name is randomized when Downtown is generated. The name "Margaret Collins" is only referenced in the game files. According to her SimDNA in SimPE, her hair was black before it turned grey.