Nota when my dad had a stroke he appeared much less incapacitated than your mum but I could see that everything in life that he valued had gone for good even though he didn't know it. At 88 he liked playing bridge, driving, newspapers and crosswords, witty conversation (on his terms) and being the competent one in his relationship. None of that was ever going to be possible again.
The hospital hadn't spotted that his symptoms had got worse since admission and that he was eg unable to start off the process of lifting a cup to drink, so he was sitting there slowly dehydrating until I arrived. Because he was posh and would respond with flowery set phrases they thought he didn't have any confusion or language difficulties when in fact he was barely communicating.
He was admitted on a bank holiday Friday and I saw him from lunchtime on Saturday. There was a top consultant on over the weekend and we started to discuss a light touch approach - humane and helpful. Then there was a new consultant on Tuesday morning. He swept into Dad's room with the team and gave a loud enthusiastic pep talk from the end of the bed about how it was a small stroke so Dad would be home soon (I'm sure it was small on the scans. The effect on Dad was not. His girlfriend was 94 years old and demented, so he was not going home).
I spoke up and asked that if Dad had another stroke or an infection, could we discuss less active treatment? I wouldn't have done it in front of dad but it seemed my only opportunity. I thought i was being very reasonable. The consultant reacted as if I'd been found holding a pillow over Dad's face. He didn't pull me aside and ask what I was thinking or what had led me to this, he just blustered. It took him another 3 weeks to agree that we were moving towards end of life, and it still took a very senior nurse at the right moment to prevent inappropriate treatment from the medical team.
I don't know what the answer is. So many families seem poised to guard against the team 'giving up' on their 95 year old crumbling relatives. Frankly I find it difficult but I have to remember that my opinion , that better a week early than a day late, and that quality of life should be more than 'still eating' , isn't everyone's.