How would you handle this?

I know a person who is 34 and recieving disability. She claims she has arthritis and can not work. She has two kids and she is always out playing soccer with them or going fishing or going mudding. She claims the arthritis is so bad and that there is nothing to help the pain of it and that is why she can not work. But yet she never was one who liked to work or really ever had to work. I have made comments to her about it and she just goes off on a sob story again. I normally mind my own business but this just seems so wrong. How do you go about proving that she isnt as bad as she claims to be? I know she had to go through and get letters and such from her doctor. But her doctor is a quack and everyone in town knows. Usually the only people that go to her are the ones trying to get disability. I have manic depression, and i went to her once to see what she would do and right away she suggested that i should go on disability. I just laughed, at her, seriously? Yes i have bad times but that doesnt mean i should get to sit home on my butt doing nothing.