Car accident/claim of injury

Hey! My girlfriend was at fault in a minor car accident about a year ago. What I saw was minor damage to the bumper of the car in front of her. The person she hit was pretty nasty at the scene and was holding her neck saying she might be injured but refused an ambulance.

Girlfriends rates went up and she got a notice from her insurance that the other person is claiming injury.

However this other person happens to have a public Instagram and is a "fit chick" so lots of posts of her doing workouts/headstands/skydiving.

Is there anything my girlfriend should be doing about this? Passing along the info to her insurance?

Edit: Accident occurred in Los Angeles, CA.