Yes, in Hercule Poirot's Christmas, Jennifer was one of the Lee siblings, who married a Spanish man and became the mother of Pilar Estavados. She is mentioned, but does not appear in the book.
Jennifer Graham has basically a brief cameo in A Daughter's a Daughter a "loud hearty voice," and wound up getting together with Cauldfield.
In The Sittaford Mystery, Jennifer Gardner is the title character in Chapter 20: "Visit to Aunt Jennifer."
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