Isabelle (Fairy)

From Spyropedia

Isabelle is a fairy found exclusively in Spyro: Year of the Dragon, in Charmed Ridge. She can be found by doing the cat-witch mini-game. She warns you about the infestation and gives you an egg if you conplete it.

From what little dialogue she had, it can be assumed that Isabelle is, in fact, Sgt. Byrd's girlfriend. If not, she was at least a romantic interest of his, in the past. She seemed very passionate about their date, fretting when Sgt Byrd turns up late and relieved when he disposes of the cat-witches.