To get back to the original subject, I'm surprised no one has flagged up that if she (the ramming speed) captain of the boat did not have a court approved alcohol test of some sort - blood, urine, calibrated breath test machine, - she cannot be prosecuted as being drunk in charge of anything.
Also, 'she was going at 10 mph' from a member of the public, even multiple members of the public will carry no weight in a court.
Criminal damage? I don't know what the definition of criminal is but the police weren't interested when my car got smashed when parked even though I had CCTV of the incident including the perpetrators reg number so why would they be that bothered about a boating bump where no one got hurt.
What's the betting it ends up as an insurance argument and her getting nothing harder than a fixed penalty fine for being naughty in a public place.
I'm not saying she wasn't guilty of all above, I'm saying what any court will say.