How can i get my lying manipulative mom-in-law to bust herself out?

She cussed my mom out, cut my husband and myself down behind our backs, lied about it, and now my husband thinks my mom and I are liars and that shes some saint who was wronged. And she did all this the week I gave birth (1 month ago) because my mom stayed with me and because I wouldn't show her my during feeding. In no way was anyone dismissive of her feelings, and we tried to include her in everything, but she couldn't stand that my husband was attentive to me. How can I get him to see the truth.