Negotiating with seller/seller finance/first time

[Nat Love]

So I am very new to REI, no experience, and no properties yet, but I just had my first phone call with a seller who may be open to seller financing. She is a very sweet elderly woman, not entirely retired from being a real estate agent. My problem is I am having trouble structuring the deal.

According to her, there is no mortgage on the home. 

The house has been on the market for a few months now. Turnkey. 

Asking price $1,075,000

From my inexperience, I’m not 100% sure, but comps seem to be in the 950K range. 

Rent comps seem to be around $4400

Insurance $12K

She says she owes 300K to the IRS because of a property that she has sold, and she also wants some money to travel with, and she would like to put the remaining monthly payments into a trust for her children. 

Can I find a loan for the 300+K? How can I make this a cash flow positive deal?

Thank you bigger pockets for the help!