So sorry to hear about this, Harvs. I can only echo what's been said, especially by Oberon.
So many of us have a close relative suffering from this. Perhaps the worst thing about it is that they often don't know why they feel the way they do, so they try to hide it because they don't think their family will understand either: it's a "black dog" which comes of its own accord, and an illness which you couldn't have cured for her. All you can ever do is try to be understanding. Don't blame yourself, mate.
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