Wow, if she took the $15,000, from what you are saying she would be leaving almost $12,000-$15,000 or more on the table, if you sold at $200,000. But if your realtor is good they can get you what the market is selling at. So if it's appraised at $220,000 and you want to get it sold fast you could drop $5,000. A good realtor would get you the market price. The more money they sell your home for the more money they make. Most realtors gets between 6%-8%, so they work hard to make sells.
Don't sell yourself short on this deal. It looks like it's a bunch of money to be made on your end. You can make out like a fat rat just by being patient.
Joejoe
M:37 W:37 T:11 M:10 S17, S13, S10, S4 BD:06/28/17 OM confirmed 07/20/17 Recon the M 10/29/17 Working hard:2gether
Onward and forward
This process is not a sprint it's a marathon! Patience, Patience, Patience.