Best advice is look into what trauma bonding is more and go from there but it’s typically a response to abuse where one person has becomes “bonded” with another due to an abusive pattern by the other party or shared trauma from past abuse it’s a very tricky thing to navigate as a third party. Read more… Ultimately the best thing you can do for now unless she speak to you about being harmed is make sure she knows she has a safe space to talk to you should anything happen and or place to come if she feels she needs an escape from it. Though don’t expect her to just do that if she needs too. From what I’ve seen those that form trauma bonds often overlook patterns that can be dangerous to them. Just keep an eye out an and open door, ask about but don’t press hard about things you notice that concern you.