“Can it be restored?”
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People are looking into it.
From this article http://news.nationalpost.com/2012/08/22/good-deed-by-rogue-restoration-pensioner-ruins-19th-century-spanish-fresco/ :
Ojeda says that art historians are now discussing if the painting can be saved.
“I think she had good intentions. Next week she will meet with a repairer and explain what kind of materials she used,” Mr Ojeda said. ”If we can’t fix it, we will probably cover the wall with a photo of the painting.”
Unfortunately, there is some reason to think the woman scraped the painting away from the wall. At that point the best best that could be done is a replica by a competent artist. As it stands the intent is to replace it with a photo of the original if the fresco has been destroyed.