girlfriend has hit traffic sign

Hi, 3 days ago my girlfriend hit a traffic sign on a main road.The sign is a bit bent.So you can still read it clearly! have now read that such a thing has consequences if you don’t report it?! my questions 1) if you don’t report it to the police, what are the consequences? 2) what if she doesn’t do anything and gets it from the green men post? she can’t afford to pay for it financially because she doesn’t have a job- she has a job. 3)If someone has already made an announcement (it happened 3 days ago) then is it too late anyway or? 4)If she does not receive a post within the next few weeks, can you say she got away with a blue eye?