You only know situation in deep but, if a Gentile is caught into the jaws of a jew, there will be strong spiritual ties Chakra to Chakra, so one of the first things to do is force situation to separate jew and Gentile in daily life, and then cut the ties from the chakras in the Astral plane with Ansuz / TH mantra vibration meditation on JoS/ToZ.
This can be done by you if the woman is not Dedicated and unaware of the ties.
This is needed because strong Astral ties from a jew to a Gentile woman like this case, will manipulate the woman's mind and emotions to lead her back to the jew. Severing ties will reduce this risk and you may pave her path tho freedom, at least the 1st mile, then she will need to advance herself.
This can be hard to do because her will may work against your meditations due to emotional enslavement, but I think it's possible.
Obviously, if you can talk to her and explain how bad is the involved jew, helping her mind to see the truth, this will greatly help.
I hope you succeed in this, if you want to do this most likely the involved Gentile to be freed is way worth the effort.
I have met people who are stuck in situations out of their control and I decided to help. It was a great effort but way worth the outcome.
My only conservative advice is, due to the high energies involved in the process, I'd pay attention not to drain myself too much and forget my Spiritual progress and duty, in the while.
Good luck with your effort. That Soul will be grateful to you if you suceed, and maybe find the Truth on here also?