Claudia is the sister of Saskia Duncan, who arrives in Walford after her sister's death on 14 February 1999. She arrives in Walford as it was the last place Saskia was seen, and her disappearance is being investigated by the police. Claudia is suspicious of Steve Owen, her sister's former fiancé (and killer), but then becomes dependent on him, alternating between the two and irritating Steve. Claudia thinks Steve is behind Saskia's disappearance. Matthew Rose, who witnessed Saskia's death, is worried that Claudia will discover that her sister is dead. She eventually returns home after Saskia's body is found buried in Epping Forest. Claudia testifies at Steve's trial and is devastated when he is cleared of Saskia's murder.
By early 2000, Claudia had emigrated to America.
- Episode 1742 (23 February 1999)
- May 1999 exact dates unknown
- Episode 1791 (11 June 1999)
- Episode 1792 (14 June 1999)
- Episode 1793 (15 June 1999)
- Episode 1794 (17 June 1999)
- Episode 1844 (5 October 1999)