Both were women involved with wealthy men. Norah was confident and generous, while Dolores was restrained and clearly from a humble background, lacking in manners.
Wealthy men usually choose to marry women from rich families. It was clear Dolores didn't stand a chance. Marlin might have a new girlfriend soon.
However, it still shocked her that after so many years, Marlin finally found a girlfriend, breaking the hearts of many wealthy ladies.