I think if you are telling the truth then you need to get informed PDQ about depression, OCD and mental health issues. If she is as depressed as you say, then it is completey shetty to start a thread, give only a part of the story, then to suggest she reads it. That's nasty.
If your wife has OCD that can be a severe and debilatating condition start to support her instead of starting threads so you can get your way, the more you raise her anxiety the worse the OCD will be. Is that good for your kids? Is it worth it? She is the SAHM those children need her to be as well as she can be. You should not be doing anything to make her feel worse.
If you suspect PND, then rather than starting threads with half a story on it, her mental health is a major part of this, you should be encouraging her to get to see her GP. If it is the OCD recurring then she needs to get back to her psychiatrist.
You should support your wife through what can be a debilitating condition. OCD can also get worse during pregnancy or early childbirth as it is a period of unknowns and new challenges.
If you want to put your children first, then put your wife first, as if she gets totally debilitated with OCD, it's happened to my son so I do have experience of this, then keep pulling against her instead of supporting her. You also suspect PND could even be both, who knows.
I suggest that you also seek out some information on OCD and cognitive behavioural therapy, you will see that what you are doing could well make the condition worse. That is not good for your children. Reassess your position in the light of your wifes mental health problems.
It turns out this is nothing to do with a controlling woman who can't let her position of mother be usurped by a father, but according to the father a woman who has some very real mental anguish she should be supported through.