She's not JW
JWs think Michael traded places with Christ on the cross.
She thinks Michael is a Christophany, like Melchizadek and 'The Angel of the LORD' in the OT
I'm not sold on what she believes about Michael, but I do think she has a much better argument for it than the JWs have for their crazy ideas.
I'm not going to make an enemy out of my sister because of this topic, even if I think she's wrong.