A woman's husband DOES NOT determine and choose if she gets into heaven or not. I'm a member of the Church of Jesus Christ of Latter-day Saints. God determines the whether a person enters heaven.
I've been LDS my whole life, I've heard a lot of "misconceptions" of our faith; the best from my uber-liberal law school students, but this is the first I've heard this one. I'm surprised I haven't got this one asked of me at school.
But no, it's not true. The only judge of who is able to enter heaven will be the one, true, just and merciful God.
Sorry, but even Mormons on FR have said as such but they argue that the men will ALWAYS want their wives to come to heaven, or planet isn't it, with them. If you never have heard this, maybe there are sects of different teachings.