Same here. I really don’t like her.
Claire believes Jenny is her friend in OL. But when we get to Voyager, Jenny’s behavior makes me doubt that she was ever really Claire’s friend but instead was just putting on a show for Jamie.
Jenny’s behavior seems more like that of a jealous and possessive mother-in-law rather than a sister-in law. Claire is a strong woman who Jamie loves passionately and is a threat to Jenny’s control over Jamie and over Lallybroch. Faced with the fact of Jamie’s marriage to Claire she makes the best of it, but when given the chance she tries to replace Claire with a woman who is not a threat to her dominance. Then, when Claire returns she interferes and deliberately tries to chase her away again despite what that would do to her brother. That is not the action of a loving sister.