Fear: Inadvertently harming her loved ones.
It wasn't just selfish emotional needs that had Ivory running from her family so long. Once she was gone she worried what the discovery of her mere continued existence would bring down upon them. They could so easily use anyone in her family to persuade her right back into their captive arms. She couldn't breath a word for fear of them being hurt. Even after many years and finally reuniting with Tobias she still holds onto this fear. Every moment spent with him is one etched with worry. Will someone discover what she is even though her form is no longer taken at all? Will they hurt him to get to her? The threat is one that she cannot determine until it has already become real and she doesn't ever want to let it reach that point. Living with this fear every day wears on her more than one could imagine. She even keeps her descendants in her sights as much as she can to protect them as well. Protection which could see herself hurt in the process. Hurt or even killed.