Being ignored by the person who admittedly damaged car, what can we do?

My boyfriend went outside a few weeks ago & noticed that someone had hit his car taking off a significant portion of his rear quarter panel. As he was taking pictures of it, a girl who lives in our apartment complex came outside & admitted she had done it. They exchanged information, my boyfriend reported it to his insurance company, & got estimates for the damage. Now the girl is ignoring him. Every time he knocks on her door she won't answer, & every time he calls her she doesn't pick up (he has left numerous voicemails). He has tried knocking & calling at many different times of day with no luck. Is there anything he can do here?