I'm joining in on the bandwagon here pmd, do not sign anything. You can give her space and split time at the house or whatever without having a piece of paper. If she really is in fear of you, a piece of paper is NOT going to do anything. Basically it has to be your actions that ultimately soothe her. If you are bringing that much pressure, then get away for a bit, let things cool down, and then discuss what needs to be done.
"Achieve success, but without vanity; Achieve success, but without aggression; Achieve success, but without gain; Achieve success, but without force." Lao Tzu
