Do I have a case here? Elderly mother slipped on urine in disgusting public rest room, forced to lay in urine for 40 minutes because staff had no key

One week ago, on our way out of town for Thanksgiving, we stopped at a Sunoco gas station when my elderly mother suffering from cancer had to use the bathroom. The bathroom was in unacceptable condition with puddles of urine on the floor. She slipped in the urine, fell, hit her head on the urinal, and was unable to stand up. When I ran to the gas station employee to get a key, they informed me that the key to the bathroom was lost "long ago". No way to enter the bathroom. My mother laid for 35-40 minutes in the urine, soaking her clothing with it. When we finally got into the room, she complained of ankle pain, and could not stand on her own for about 20 minutes. There was a red area on her forehead which is probably where it made contact with urinal. There are no long term injuries that we can tell, and we unfortunately did not contact authorities or seek medical treatment at the time due to being out of town and her refusal to do so. She is emotionally traumatized over this.