Nothing she is mother of His human side not His divinity She is a sinner like you and me. A redeemed Child of God.
Hail full of Grace is what Gabriel called her. I heard it explained once that Jesus could do anything he wanted to for his mother because he is God. And being God he is not bound by time - always was, is and will be. So he’s like, I want my mother to be born without original sin and wow, she is born without original sin. She is the holy vessel, the tabernacle of the messiah. Why is that threatening to you?