Where do you see anyone claiming that anyone can "come to the Father" through Mary, apart from Jesus?
The Catholic formula is "through Mary to Jesus," NOT "through Mary to the Father, and just leave Jesus out of it". What you're doing amounts to a strawman argument.
The biblical formula as spoken by Christ in John 14:6 leaves no room for mary or anyone else regarding salvation. The NT is crystal clear on this. We have no NT examples of Jesus, or any of the writers, saying we must first come to mary and then we can come to Jesus.