A: No, a mediator's job is simply to serve as a facilitator towards the goal of reaching an agreement. The mediator doesn't represent either side, and the mediator doesn't get to determine liability or damages. Importantly, you aren't forced to enter an agreement if you are in mediation.
A: Depends on whether that money is spousal maintenance, child support, or just an agreement related to the property division. You should take your divorce decree to a local divorce attorney for a consult.