Amanda was the only child Rachel and Mac had together despite their long and often tempestuous relationship. Amanda came home after graduation boarding school, and got a job working at Cory. She fell for Sam Fowler, but didn't tell him she was a Cory because she knew that he'd drop her if he knew how wealthy her family was. Eventually Sam did find out, but by then Amanda was pregnant. They wed shortly before Amanda gave birth to her only child, Alexandra (named after Mac's mother). Amanda, who was always very close to her father, was devastated when he died of a heart attack. Their marriage fell apart when Sam found out she was sleeping with Evan Frame, but the two got back together again for a short time, until Sam left Amanda to focus on his music career.
Amanda began writing a biography on Senator Grant Harrison, and after his marriage to Victoria fell apart, the two of them began a romantic relationship. Then Evan Frame came back to town. He tried to start up a relationship, but Amanda wasn't interested in cheating on her fiance. When Amanda and Evan were in a car accident together, Grant assumed she'd been unfaithful, but married her while she was still recovering. She spent months in a wheelchair with Grant calling all the shots, but as soon as she could walk again and realized what a skunk her husband was, she divorced him. When his mother showed up in town pretending to be Rachel, Amanda left, feeling like her mother didn't want her around.
Amanda returned a few months later, determined to break her mother and Carl up. She pretended to be a woman named "Hadley Prescott", who was having an affair with Amanda. Eventually she was found out, but not before developing feelings for IAD officer Neil Johansen, co-owner of the Herald Jake McKinnon (Matt had given Amanda his half), and carpenter-turned-doctor Shane Roberts. After Carl was presumed dead, Amanda put her anger with Carl behind her to support her mother.
Amanda began a romantic relationship with Frank Cameron, a convict-turned-FBI-agent who was sent to infiltrate the Cory household. Despite misgivings about his past, Amanda fell in love with Cameron, who she discovered was really Cameron Sinclair, and the two began to plan their future together, until Amanda discovered that while she and Gary were fighting for their lives, Cameron and Josie were making love on the beach. She was able to forgive him for the affair, and the two began planning for their wedding. On the day of the ceremony, Amanda learned that Josie was pregnant with Cameron's baby, and he'd been lying to her all along. She called off the ceremony, then spent a time being stalked by Jordan Stark, who knew that Amanda was the reincarnation of his dead wife, Amalie Kittridge. Cameron was instrumental in saving her, and the two ended up getting married after all.