How to get this one done?

Met a 94 year old lady today, by mistake, looking at another house, but rode down the other end of the road and saw her For Sale sign. She has 11 acres, zoned AF, but is actually commerical on a nice highway, major in my city. She wants $500k for the entire property. However, she does not trust anyone, and will not sign any paperwork, except the sales contract with her PRICE. I had thought of an option to remedy this, but she will not sign that either. Is she a lost cause? ANY ideas?

The other house scenario is this, a Probate house from one year ago, I was in the Probate office, took Preston's advice and decided to try that avenue, well as luck would have it, I met the lady, the daughter of the deceased woman of the house NOW. THen I gave her my card, and she did not want to sell. SHE calls me yesterday,wants to sell now, so I  today go to check out her house, she is out of state. Only problem, the house is full of moldy mildew, smell! It does have 2 attached mini apts-moldy too. It is potential commercial and sits just down the other side of the major highway mentioned earlier. My approach to this property is this-option, aah, it is tax assessed for $54k, any suggestions? I am still working on getting that FIRST deal, have not given up just yet. Thanks in advance.