Because when I was a Protestant it seemed like they brought her out of a box at Christmas for the Nativity scene, and then packed her away for the rest of the year. That was pretty much the only time she was ever brought up in conversation.
In contrast, Mary Magdalene was talked about very often, and especially at Easter. (Mary (Jesus' Mom) wasn't mentioned that often even though she was at the foot of the cross too...)
Not to mention the fact that she was with the Apostles at Pentecost, but when speaking about Pentecost everyone would talk about the Apostles and skip over her...
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