These posts could be that as you say, others are sharing, and hitting her page as public posts. That is a privacy adjustment fb setting issue. You yourself can stop seeing these posts. Ask your children how to tweek your privacy settings so you dont see them.
You should talk to your Priest, tell him you are on her fb page as a friend and see posts from others on her fb wall.
I sill firmly believe you should have declined her invitation to be a fb friend.
Right now people on this thread are jumping to conclusions like deliberate sharing etc. Fb doesnt just work like that. If you are following someone on fb, which this guy is doing, you will get all their friend activity that is posted as public. So it is your responsibility to go govern what comes across your wall.
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