Sorry to hear about your mom. My heart goes out to you and yours.
As for your W, ignore her as best you can and just be there for your mom. Outside of your mom and your family....everything else IMO, is secondary.
Take care of yourself.
Eric
"The difficulties of Life are intended to make us BETTER,not bitter". "Fear is a prison, where you are the jailer. FREE YOURSELF!" "Life is usually all about how you handle Plan B." - Jack3Beans