Marcia was a devoted wife and mother, but when that dynamic was threatened by Carrie, she started to show signs of hostility towards her. She later caught Paul and Carrie having an affair, which resulted in a war of words between the two of them.
Marcia later showed up at the Models Inc. Agency, wanting to confront Hillary Michaels, but when Hillary was arrested for murdering Teri Spencer, Julie Dante was the person she came into contact with. Julie basically told her to leave the agency out of her persona life, causing Marcia to storm out of the agency after defacing a picture of Carrie on the wall.
Marcia later tried to commit suicide by overdosing on pills. This caused Paul to want to leave her.