OK I sort of hate myself now for looking into this...but from other Tweets in her feed seems she was in ATL filming an episode of Drop Dead Diva. The person in the seat in front of her apparently reclined into her bumping her head & causing the black eye:

Really?The a$$hole infront of me almost knocked me out putting her seat back Might get a black eye Im going2 kick her seat all the way to LA ($$ editing mine for the sake of decorum)

Later: After kicking her seat form [sic] giving me a black she confronted me and laughed at the fact she gave me a black eye! What a # (offensive material after the # removed)

@MissKellyO if anybody else wants to follow the rest of the drama.

OT - I'm not a prude but man that girl has a potty mouth in her Tweets! Wonder how many of her 2 million+ followers are teen/pre-teen girls. Such a great example for younger girls.