Luge62:
Some other options to consider (Not that they are any better than the ones brought up so far. In fact, these are challenging to carry out, and may not be recommended by experts.)
1. She can submit -leave- a note to her husband or elders stating that she has left the state with someone of the opposite sex without further disclosing details. She will perhaps be disfellowshipped at once, and her husband may proceed filing for divorce. Further consequences: She will be shunned by the family for indefinite time, maybe forever, she may lose any rights to her portion of the assets.
2. Your mate can claim before her husband or elders that she started having sex in a moment of weakness with someone outside the marriage bond. Afterwards, she realizes now she doesn't want or need her husband for emotional or sexual needs. She could claim that her marriage is irreconcilably broken, not only because there are far too many unsolved differences between them, but also because she feels she is repeatedly being verbally abused by her husband and not getting the respect that is due to a marriage partner. All this is affecting her health and sanity. She would have to firmly stand her ground and willing to never go back to her husband.
These options are assuming they are true. No one is encouraged to lie or deceive a mate for selfish gain.
Regardless of the action she is willing to take to be with you, you would still be left with a religious victim that may never recover from her losses. She may never be happy in her new arrangement when everything is said and done.
Is it really worth it? Only you can decide that. No one else can do it for you.