Please help!! how to console a broken heart parent?

My mom is suffering sooo much. My father left her. Their break up was bitter. She is over 60 and is left with not much money. She supported my father and expected he will take care of her in old age. But he refuses. She became grumpy and bitter about him cheating on her and going for a younger woman. She cannot live without him and she always expect that he will come back to her. Which i am sure he won't. He always says mean stuff about her behind her back and my dumb sister tells her. I want to cheer my mom up and it exhausted me how much i try to get her out of this dark pit. Any advice is apperciated

Please help!! how to console a broken heart parent?
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