The weird thing is, AFAIK, burning the Quran is one way, probably the best, to get rid of it respectfully to prevent any bad thing to happen to it, like burning it if it got so torn up beyond use or to protect it from abuse. After all, burning can completely get rid of all words in it. I'm a native from Makkah and grew up learning Islam from two native parents from Makkah too, so I know that for sure. I can't believe they did that to her.