Hello @Nicholas Renshaw, first of all, congratulations on taking action. Many who are part of BP never get past reading posts. Way to go!
There are a few things you will need to find out, by asking your seller:
1. "What would you like to have happen?" You already got the answer to that question, which was that she wants to sell the house, and remain living there.
2. How far behind on the mortgage are you?
3. What is your monthly payment? Does that include taxes & insurance (PITI), or is that principal & interest only (PI)?
4. If we could put a deal together so that we buy your house, and allow you to remain living in the house, would you consider keeping your existing financing in place, with us taking over the payments?
There could be a considerable amount of equity in this deal. IF the market value remained at $549K, you're looking at a $175K spread. 2006 was the year before the "bubble burst"; check the MLS to determine the comparable sales for the property. If you don't have MLS access, find an investor-friendly realtor, and ask them to pull comps for you.
If the seller is willing to sell you her house subject-to the existing financing remaining in place, get a copy of her current mortgage statement. You will need to know the details of the loan, and the amount the loan is delinquent (has she received a notice of default, or letters from an attorney?) The amount of arrears will help you to determine whether or not it is worthwhile to buy this property, since the loan will need to be brought current when you buy the house.
Not to mention, IF the seller wants to live in the house after you purchase it, how much is she willing to pay each month to live there?
Ask lots of questions as you work your way through this deal. Get good advice (do you work with an attorney in your area? If not, start looking for one!). Don't give up!!