warning : graphic images .
megan sheehan was arrested in 2014 for suspicion of resisting arrest , battery on a police officer and public intoxication .
she is filing a civil lawsuit against bart and oakland , california , police who she says used excessive force during the arrest .
she claims she was violently slammed to the ground , where she was then left bloodied and unconscious , with several broken facial bones .
police report says she was ` violently punching ' and ` guided ' to the ground .
attorneys for bart say sheehan is partially responsible for her injuries .