Husband's Mother hurting him

My husband and I are expecting our third and last child. This will be our only boy. So my mother is throwing a small baby shower. This is huge for my husband, he is finially getting his little boy. Well I have asked his mother, my mother in law, several times now for address for her family. She blows me off. He has also asked her. Same response. Now I could not care less about her, she has made it very clear that she does not like me, that I am her son's biggest mistake. Needless to say, she hates me. My question is how do we or just my husband explain to her that she is hurting him not me. He has expressed his feelings to me and had told to just not invite them. Now I know she will make it look like I did not include her or her family. I just want her to see how much she is hurting her son. Our children are her only grandchildren and she is so close to just pushing us all away. This is not the only time we have had issues with her.