Unless there's some hidden issue, I think you're just unlucky. Check the Predator Info button while in-game to track her status. Even if you haven't met her yet, it will still say which predator she's been eaten by (when she is prey to a predator). If it says she's outside, then check again after 12 in game hours pass. Consensual Predators will recover between predators, so they do spend some time outside.