dear MissGivings (MG), I feel so very sorry for you, to have this MIL who is demanding and coercing every event just to demean you.
You are the person who chose your husband to marry, not the MIL, and what she leaves in the will be left to your husband, and anyway what a parent leaves can sometimes be so disappointing as it was when my D ad passed away, he left half of his finances to be split up by 5 kids, while the other whole half went to his one and only step daughter, that's his decision so all of us 5 kids have to move on, even though we are puzzled.
So in other words having a will dangling over your head as a threat should just be put aside, as in my case who knows what's going to happen.
Don't let this MIL have control over you, take the control yourself and get on with your Real Estate, this must be so exciting for you, it's something I had always thought of doing. Geoff. x