It is the morphine that is scrambling your mother's brain. I have seen its effects when my father was put on morphine in the last few days of his life before he passed on and I couldn't believe some of the things that came out of his mouth.
That is the bad side effect of morphine. Also had a mixture of other drugs to control his cancer. If I were you, I'd speak to the doctor(s) about your mother's medications and see if something can be worked out. Goodness knows how many times the doctors had to adjust my father's assortment of medications before figuring out a relatively good "workable" formula.
Hope this helps, Tad. I'm sorry that you and your family are going through this now with your Mom.
I'm sorry that you and your family are going through this now with your Mom.