How do you block someone 100% on Facebook?

[Amethyst Kitty]

I blocked someone from my Facebook and somehow she can still see me and know what I am posting and where I am posting from. I checked and made sure that I blocked her. She can tell that I am at home posting! I checked with Facebook and it states if you block them but are still in the same groups as they are or using the same apps that they may still see you. How can I block her 100%? Facebook keeps changing the security and privacy settings and it is difficult to keep up with. Please tell me how to get rid of this psycho!

[Bob]

Change the privacy settings (that is who can view your profile) to friends only. That way only your friends will see your post etc.

[sarahbobarah]

You must make sure your posts and profile are not public. Friends only on everything. Then you need to make sure she isn't just seeing it through a friends account. Every post you make needs to be friends only. Ifshe is still seeing it, then maybe a mutual friend is helping her see your posts or telling her about them.