That scenario might also explain the jealousy, because if she saw another woman get what she wants but thinks she can't or shouldn't have, that could also make it too hard for her to stay in the situation.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.