I'm guessing she's not only an undocumented worker, but probably doesn't even have a license to drive (which could also explain why she doesn't have insurance). I know those are big assumptions, but then again, this isn't really an uncommon situation. You do what you want wrt filing a police report, but I wouldn't be shy about asking for damages simply because her employer is paying for it out of pocket. I'm pretty sure both she and her employer knew the risk they were taking with her driving.