Final answer:
Without additional context on the characters Claudia and Frieda, it is not possible to determine why Claudia is jealous of Frieda. The provided excerpt discusses different characters and themes of jealousy and succession.
Step-by-step explanation:
The question refers to a scenario involving jealousy between characters, which suggests a context from a literary work or drama. In this case, it appears to be a dialogue excerpt from a play. However, the characters Claudia and Frieda are not mentioned in the provided reference, which instead discusses characters named Nora and Rank.
Without additional context about Claudia and Frieda, it's unclear why Claudia might be jealous of Frieda. The reference to 'poor Christine' and the mention of a 'successor' suggests themes of envy and replacement in relationships or social positions, which are common elements in literature.
In this section, Claudia is jealous of Frieda because Frieda is expected to succeed Rank as the head of the household in the future.