Well, home teachers, visiting teachers, sisters, elders quorum presidency, relief society presidency, and the bishop would seem the best recommendations. These are good general support resources. The tricky point in such a situation would seem to me to be receiving support without alienating the husband who is supposed to be the support. The church is very interested in the family, so alienating a husband from his wife is something that is generally avoided. For example, if the church set up a "coping with an anti-mormon husband" support group, that would be problematic. ("See you hubby! I'll be back at 8:00. I'm off to go get more support for coping with you!") What will generally be needed are good friends (visiting teachers a good start, hopefully) some kind of access to priesthood power (home teachers, hopefully), and to find ways to express genuine love for the husband for the things that he does well. There are probably insecurity issues undergirding the husband's developed antipathy towards the church. If it is possible to find out what the husband's real concerns are (such as "the church is usurping my leadership in the home"), it may be possible to correct an underlying cause. (do home teachers neglect to defer to the husband, or are his plans being canceled for activities he wasn't privy to?) A general note about home teachers and visiting teachers. If they're not doing the basics, then call them or call their leader. (Find out who they are, or make needs known so that they'll be assigned.) Give 'em a figurative kick in the pants. Many a home teacher needs that.

http://FacesEast.org/ is a discussion forum "devoted to the ideal of eternal marriage, even when a spouse does not accept LDS beliefs." Most of the posters there are married to someone who has left the church rather than someone who has never been LDS, but they are a great source of support. I'm sure you would be very welcome there and have much in common with them.

Leave the church. It's a cult!

Why can't they both just set boundaries and be free to believe whatever they wish to? If he wants to be Anti-Church - great, let him be. If she wants to be Pro-LDS Church - great, let her be. What's the problem? If she would set a boundary there would be no need for "support" because he's doing NOTHING wrong!

What about her family?

My brother is LDS and he said Jesus was just a man. But I know He was not just a man. He was fully human and fully God at the same time. He lived as human before He went to the cross.