I reread my post, and I really wasn't clear. The nuns told the students that the students were not to see the film, I presume because Hepburn's character has difficulty with her vow of obedience, and, even worse, in the end gets a dispensation from her vows and gives up being a nun.
These would be good reasons for prohibiting the nuns from seeing it, too. I guess it might have given them ideas.
https://en.wikipedia.org/wiki/The_Nun%27s_Story_(film)
I always find it interesting that most (or all!) religions don't want their followers to get any notions that go against their teachings.
It makes me look at them as though they have no confidence in their beliefs, teachings, etc. if someone could come along with a
movie, or even a joke, and their whole world would fall apart because of it. Wouldn't you want the convictions of your religion or
spirituality to be strong enough to withstand these tests instead of keeping yourself hidden away from any and every contradiction?
Scientology (which I don't even consider a religion) is the worst. They are constantly disavowing every person or little idea that shows
them in a negative light, yet are completely hidden in their inner sanctums. Spirituality is NOT confining. It's all embracing, all encompassing.
If nothing is wrong with Scientology they should not be so afraid of sharing it with everyone instead of recruiting people into their cultish
environs.
So, the idea of nun's not being able to see The Nun's Story is very strange to me. Not everyone is called to be a nun, so a story about that
shouldn't harm those who already are.