OMG.... well, the plus side is that the fresco is now going to get some attention. Hopefully they can repair the damage.
This isn't the first botched "repair". Still, the old lady's heart was in the right place... it was really the guy who let her do it that should be blamed.
Well, over the centuries, plenty of restorations have modified originals to ridiculous degrees. Vermeer’s ‘Girl Interrupted in Her Music’ had a birdcage added in on the top left by a later hand in order to symbolise how a woman should remain ‘caged’ and not go about gallivanting with strangers and getting drunk.
The biggest for me, however, was Michelangelo’s ‘The Last Judgment’, where Pope Paul IV had someone paint over the originally naked genitals of the gathered folks. Even in 1993 the restoration covered up the naked figures…