How to prevent all of my Facebook friends from seeing posts/comments from one certain person?

My cousin always embarrasses me with stupid comments and posts on Facebook. I think she’s jealous at the fact that, even though I am younger than her, I have more friends and friends that actually comment on my wall. Anyway, I was wondering if there was a way to block all of my friends from seeing post/comments that she pits on my wall . I can’t seem to find a way, so any information would help. Thanks.

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