Mary is the new Eve.Your Mom is the new Eve.
Calling the Mother of God ..."MOM"....is an exceptionally obnoxious late 20th century habit that is nothing but an extension of the most banal of Catholic piety.
I don't even call my own mother "MOM"....I have too much respect for her as a mother and as a woman.
"Abba" means "Dad", basically.
There's nothing wrong with calling her God's Mom or anything like that. And yes, she is the Church's Mom. Typically, I say mother, sure, but mom is fine.