Does Parnoth's daughter have a claim on Windheath's throne or am I mistaken?
That is correct. She rolled up high on beauty/looks and she will probably will become Edgard's prime wife.
E: its not a claim per say, but she is a true Conricht by blood, unlike Albert or Richard, who are Conrichts by their mother's marriage.
E2: I learned of this from Charles(Iituem) well after my marriage arrangements were in motion.There is no deliberate plot attached to this.