Senior needs advice?

I have a sister, as senior citizen, who has a home she bought for 200K years ago.. She owes 100K, the house is now worth 700K. Her objective is to retire, so she wants no mortgage payment. What can she do to keep the home, but lose the mortgage payment, and please explain in details a person with no training in... show more I have a sister, as senior citizen, who has a home she bought for 200K years ago.. She owes 100K, the house is now worth 700K.

Her objective is to retire, so she wants no mortgage payment. What can she do to keep the home, but lose the mortgage payment, and please explain in details a person with no training in finance can understand. Thank you.
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