what does it mean when i get a news feed from someone who isnt my friend on facebook?

Ok so i sent a friend request to this one chick, and on her profile it says "friend request sent". Tonight i get online and it shows a news feed from her, but she isn't my friend, and the other person in the feed isn't my friend either. What does this mean? oh also this is the first time she has ever showed up in my news feed
 
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