How can I prevent my friend from being able to view my posts?

[Anne]

I have this friend on Facebook and her and I have 3 mutual friends.

I recently haven't been having the greatest relationship with her but I don't want to delete her. I have good relationships with the 3 mutual friends, though.

I don't want her to be able to see my posts anymore and I know that you can customize your posts and choose who can view your posts. However, even if I include her name to not be able to view my posts, I'm afraid that if one of our 3 mutual friends comments on my posts, that those posts will appear on her news feeds and she will be able to view my post along with their comments.

How does this work? Will she be able to see the posts (that I post) that our mutual friends comment on?