That's the problem in a nutshell. It wouldn't be fair to her to put her in a situation that is an occasion of sin.
I keep telling her she is in better shape than me because she will have a Baptism of desire if anything happens to her. I'm an old sinner with a lot to answer for.
I would love for her husband to be interested in coming back to the Church, but he's not. No class is going to do it.
We've been through all the human attempts at solution of their marital situation. Only the Holy Spirit changes hearts, that's the ultimate truth and that's where we are at.
She desires to regularize her marriage, and her husband will not consent to it. In addition, she wishes to receive baptism (if she's not baptized) or make her profession of Faith, and receive the Eucharist.
Some of these things can be worked out in the internal forum.
Whatever, continue to encourage her. She is seeking God, and the Church will do what it can, where it can.