Fiona comes and goes as mysteriously as ever. She helps the king out when asked and is known to be a Trump Artist. Fiona is treated as in the books, as a sharp tongued, often irritating, extremely knowledgeable about occult matters and a Pattern wonk. Nobody wants to get into a mental duel with her via Trump but it’s not like she’s gone around kicking their asses psychically. Maybe she can, but if so she prefers to keep them guessing.
Fiona has attuned to the Glamour power after observing the lack of ill effects in
Andre and his servants.
She and Merlin determined Greyswandir's part in the Corwin-Deirdre debacle.
She was monitoring Dworkin, Corwin and Random's activity when the Serpent attacked them. It captured (swallowed) her and tormented her until Dworkin snuffed her life.