So, a feeble old lady ruined a 19th Century painting of Christ and we're supposed to be shocked? Paintings are vandalized, damaged and ruined all the time; a piece from the 1800s has sentimental value, but it's not like she attacked an exceptionally fine or valuable work with her amateur paints and curious choices. When I first saw the comparison, I had a hard time understanding why there is so much fuss. She clearly went off the rails and shouldn't have been allowed near the original; but the original wasn't all that great to begin with.
From the photo above on the left, someone with some skill could reproduce it and replace it; the level of detail isn't that high. It would be infinitely better than letting the version on the right survive in any form.