Hi Sandy,
There are 5 stages of grief that we all go through, be it death or a traumatic occurrence, like being diagnosed with diabetes for instance.
They are, Denial, Anger, Bargaining, Depression and Acceptance.
It sounds as though your Mum has accepted what will be .
Go there ,help her plan her funeral if that is what she wants to do,laugh, cry, say all the things that you want to say so that you can look back and smile at it and say, “I am at peace because I said everything I wanted to say and she knew that I loved her”.Remember the good ,past times with her.
Ask her where she wants to be, what she wants to happen. She may want interventions, she may not ,these are her choices to make .Above all just be there ,Sandy and don’t hold back.