Purchasing a Vacant Property with Deceased Owner

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Hi all,

I found a vacant property in a great area and may need some creative thinking to seal the deal.  The owner passed away and has no family, per the county property appraiser office. They are in a holding pattern until any family steps forward, or else it will go to auction in a couple of years. The mortgage has been unpaid since November 2018. I have been researching and found out the previous owner has a sister that lives out of the country and I think I have found her. 

What are some creative offers I can make in this situation considering some of the legal issues that the sister may need to go through? If she wants to sell, Id like to make things easy for her and I am unfamiliar with this type of situation and purchase.

Thank you in advance.