Mark Kohler explains how to avoid selling a home to pay capital gains tax: borrow against your equity instead. A home-equity loan or cash-out refinance lets you spread the tax bill across monthly payments while staying in the house, then pay it back when you sell or get a windfall.
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If you were to sell the property to a third party, take that money and pay off the conversion, that's great. But, yeah, you're not going to be able to live in it. And what she's trying to do is keep the house. She's trying to harvest the money in the house. You could offset it with some other investment. I was also thinking she could borrow against the equity of the home. If you've got that much of a gain in sitting in the home that you could use to pay the tax. I know interest rates might not excite you right now, but you could borrow against the equity in the home, pay the tax, and now you're just paying that tax through a mortgage payment with some interest. And when you have another windfall, you could pay that mortgage off. You could sell the property down the road, but that allows you to stay in the property and get this conversion done.