Hi, you may want to private message her, since the thread is 32 months old. But even though the doctors will say Mirena is not the issue, she should INSIST on getting it removed. So many women have had issues with it, it would make sense to remove that variable that is most likely the cause. I'm sure by now you've looked around enough to realize all the issues women have been having with it.
Best wishes for your wife, and she's fortunate to have such a caring husband! Please post back on her progress if possible.