Anne raised a good point about the husband enabling the wife.
I found in the kh's I was in that people did not want to talk about the mentally ill members of their family. They just learned to deal with it and didn't want to appear spiritually weak. That is why the WT culture is so dangerous. They teach that the ill person is not praying enough, not waiting on jehovah enough, not studying enough, etc. When really their mental illness has NOTHING to do with any of that. They need real help, not the kind the elders give by quoting WT articles. But real mental help, medication and stress reduction.
I think the rate of mental illness in the JW's is much higher than other religions because the culture they are taught shuns getting help from outsiders.