So let's talk about what you have to work with for integration.
- Does the flock free range at all? Is snow cover preventing it?
- Can I get some good photos showing the layout of the coop and run in detail?
- How much time do you have to available to spend directly observing the flock? How cold is it? (I did my last integration in February however it was a mild Feb in 2020.)
- What is your roosting situation? How crowded is the roost?
That will give me a start in understanding what we have to work with as we build a plan.
Myself, I would just integrate her and keep her at this point. I don't think any of the other rescuers care one bit about her and she is now attached to you. Even if she has issues with the flock, and she may not, she will have you to support her, much like Phyllis has me.