I can sense your hurt and pain through the message. As I read the message, the issues are mostly created by your in laws, their interference in your family life. You want your wife to stand with you, to speak up for her husband, which is obvious and you have that right to expect this from your wife.
I also hear John, that you are making all the efforts from your end , and you do understand that only you pushing it from your end will not work. Relationship/ Marriage, these are two way streets, you alone cannot make it work.
If possible try to communicate with her, listen what is her part of the story. If you both come to same page, You both can go for marriage counselling, as you wrote you wish to understand her angle to the situation as well.
I understand this is a difficult phase for you and there is still a lot to explore and discuss. Please connect with the experts on the platform, we will be happy to help you.