
Pat M. answered 08/26/20
Skilled with experience in comparative and world religions
From a Christian Pastor's perspective, a lot of the answer hinges on her husband's faith. The Apostle Paul speaks directly to this situation in 1 Corinthians 7 IF her husband is not a Christian and wants to abandon the marriage. If he does so, she should let him go. The passage is clear that she should not attempt to make him stay if he doesn't share her faith.
If not, there is still little she can do to make him stay. Her last act of submission as a Christian wife to her husband may be to let him go. It may also be to fight for her marriage. Sometimes letting go is the best way to fight. I have seen many marriages reunite after circumstances like these and flourish.
She is right to attempt to maintain her marriage until that option is taken from her.