I wouldn't be surprised if she did try out for the Bachelor/Bachelorette but for whatever reason didn't make it. Survivor was probably her 7th choice.
And she was selected because they needed another bikini-clad beauty pageant contestant. I wonder how long it will be before "Honey Boo Boo" is eligible to try out. ("Former 'Toddlers and Tiaras' and reality show 'star.'")