From Protector of the Grey House:
If for some reason Donavon didn’t believe her, Natalia would step in and tell him who she was. Then she would do everything she could to get Ashley out of the house. Her priorities had shifted. The girl had to be kept safe. Although she didn’t tell Ashley the psychology behind it, Natalia knew what it was. Ashley was roughly the same age as her own child would have been, and Ashley was way too much like her. They were kindred spirits and she wanted to keep her alive. It probably wasn’t smart to use the girl as bait, but Donavon had already started a relationship with her. It might be easier to get free if Donavon thought the girl was his.