Cataract surgery for someone between Stage 5 and Stage 6?

Hi all,
My mom has advanced Alzheimers and Vascular Dementia. I guess it is between stage 5 and stage 6. She gets full time care in a skilled nursing home. She can´t do any daily tasks without assistance (though the nurse sets her up to wash her own face and brush her own teethI, can´t walk, needs a machine to take her to the toilet, and has trouble eating on her own though she still does it with her hands. She is only 77 years old and was diagnosed with dementia a few years ago. 2 years ago I found out she needed cataract surgery but I could not proceed at the time because she kept getting infections and then couldnt swallow. About 10 months ago her swallowing abilities returned and she is actually doing better physically. She has become more social. In the mornings she knows who most people are and knows where she is, she sings, recited some poetry and songs from memory, and can hold conversations about 50% of the way through. She still has her identiy but sometimes she things she is in her childhood and remembers a lot of details from her youth though not so much that is recent. She still jokes, picks out clothes, and likes to look nice. She enjoys music and poetry. In the mornings, I can clearly discuss cataract surgery with her and she wants it. In the afternoons she sundowns and doesn´t always know where she is or where I live, is crying a lot and agitated and is very disoriented and gets words confused. However, she is so social and would like to see people and see the food on her plate. Her PCP thinks she could really benefit from the cataract surgery. The surgeon was hesitant because he said its rare to do cataract surgery at this stage of dementia, but said he could try it on one eye. The idea is to start it with an IV sedative and local numbing. He said he would only switch to general anesthesia if he absolutely had to and it would be brief. Surgeon says even 1 eye would be helpful. If she doesnt have the surgery and lives another year or two she will be blind by then and it will probably be too late from a cognitive perspective to do the surgery. The idea of condemning her to blindness on top of everything else is too hard to bear. But what if she doesnt recover well from this surgery or needs the general anesthesia? I am afraid of a decline or other complications. She also has an underlying mood disorder which I also don´t want to trigger. On the other hand, if she could see people and food, she might do even better and she wouldn´t suffer as much. I just fear if I don´t do it in this time period, it will be too late. Even my mom said ``it would be a missed opportunity.`` In the nursing home, they can do eyedrops and make sure the shield is being worn but they cant closely monitor her every second so I was thinking I might need to have someone with her a few days to make sure she isnt scratching her eye and to help her calm down. I am not sure I can be there. I was just visiting her for 18 days and needed to get back to work. Has anyone been through cataract surgery at this stage of dementia? What do you think? What kind of questions should I be asking the surgeon, nursing home? How could I prepare for this? Am I doing the right thing? This is so hard on me. I am in my early 40s, live far away, and am her only family involved though I have a friend visiting her. I am feeling a lot of weight from this decision and would be so grateful for insights.