This will prevent Susan from sending you messages, friend request or from viewing your profile. They will not be notified. Comments on discussion boards from them will be hidden by default.
“God is eagerly waiting for the chance to answer your prayers and fulfill your dreams, just as he always has. But he can't if you don't pray, and he can't if you don't dream. In short, he can't if you don't believe.”
―
Jeffery Holland