Twelve stars, what would those mean if it was Mary?
That she had twelve children?
Genesis 49:28 ¶All these are the twelve tribes of Israel: and this is it that their father spake unto them, and blessed them; every one according to his blessing he blessed them.
That would be pure speculation on my part, as the scripture does not interpret Apocalyptic numerology at all, but yes, I think they represent either the twelve tribes of Israel or the twelve apostles. Twelve generally represents completeness.