My findings...

"As far as I know, we do not understand why gravity does what it does, (As in tht cause of it) however we understand, or belive we understand, what its effects are. "

http://www.physicsforums.com/archive/index.php/t-100334.html

http://www.universetoday.com/74015/what-causes-gravity/

I may need to expand on this conversation between Wendy and her Councelor, but what she says is fairly accurate.