While working her community service at the hospital, she came across paper work that said that Shawn Douglas was Claire's biological father, not Phillip. The test proved that Shawn was Claire's dad and all charges were dropped against Chelsea.Chelsea knew that Shawn would not believe her, so she left the paperwork for Shawn and Belle to find. A fingerprint sample revealed that Chelsea's prints were all over the paper. Abby introduced her geeky cousin, Nick Fallon, to Chelsea one night at Dune.
Chelsea was terrified that Bo would turn her in, but Billie stepped up to take the blame.
Bo found out that Chelsea has been driving the car and tried to protect her, but Hope was furious with Chelsea.
Chelsea was so determined to get Patrick for herself she drugged Patrick, and when that didn't seem to work, she spiked Billie Reed's drink at Alice's, not realizing it would drive Patrick and Billie into each other's arms.
On the day of Abby Deveraux's seventeenth birthday, Chelsea, Abby and her parents had been out for the day until they ended up in a horrific car accident which took the life of both of Chelsea's parents.
Hid Ford Decker's body (December 2007) Drugged Ford Decker which contributed to his accidental death (December 2007) Accidental hit and run of Zack Brady resulting in his death (December 2005) Numerous driving infractions Spiking a drink belonging to recovering alcoholic Billie Reed Drugging Patrick Lockhart with the hopes of sleeping with him Chelsea was introduced as Abby's best friend, supposedly a 'good girl', but in reality Chelsea was encouraging Abby to smoke, drink, and lie to her mother.
After meeting Abby's family friend Patrick Lockhart, Chelsea became obsessed with Patrick and determined to have him, enlisting Abby's help in first keeping Patrick away from Jennifer Deveraux, and later also enlisted Abby to help her keep Billie and Patrick apart.
Chelsea schemed to keep Bo and Hope apart so that Hope would not convince her Bo to turn Chelsea in for Zach's accident.
Eventually, Chelsea did turn herself in for being responsible for the accident and she was given community service for her involvement in Zach's death.
Upset over loosing Chelsea's friendship, Nick slept with Chelsea's mother, Billie.