Questions about real estate, contract agreements, and suicide…

My mother died last August and I am learning from a lawyer that she spoke with someone about selling her home and the buyer is still interested.

The problem is that they say she agreed to sell it for a ridiculously low price. I want them to pay fair market price.

What can I do? I haven’t seen a written agreement but that doesn’t mean they don’t have a crude copy of something scribbled on a legal pad, because that’s something my mom would probably do.

Anyways, shortly after making this agreement she took her own life. I don’t believe she was in her right mind at all.

Am I absolutely obligated to honor her agreement or are there stipulations the buyer needs to meet?

I live in Iowa.