The mortal human Mary gave birth to Jesus, who was God become Man. She really has no more important significance in Christianity other than that.
“She really has no more important significance in Christianity other than that.”
Sure she does. There’s no way the God who chose her to carry and give birth to His Divine Son could possibly have her be of “no more important significance.” I bet your mother played a role in your doings after your birth - even if only in your thoughts of her if you were given up in adoption.