A cup of tea will definitely help.
I am not crazy about the self binding method, as I think it is harder to do than 'regular' binding. That said, I know a lot of quilters that do self binding all the time.
You are a good daughter for rising above it. One day, you may actually miss her nagging. (Really, in a hundred years, who is going to care about your binding?) Besides, you could always say, "But Mom, I can't do that binding as well as you do."