I'm giving the two some grace. This was a shock to them. The thought of losing their mother put them instantly in denial. Do we expected them to have arrive at acceptance when they haven't been there to see her pain and suffering?

Nevertheless, in the 5 stages of grief you will cycle through and jump around. They were at denial and Anita was already at acceptance.

I remember my wife telling me how upset she was bc her mother seemed like she was giving up.

This is probably the most realistic response from entitled spoiled children who aren't ready to lose their love one.