Perhaps she should broach that subject with her surgeon, and with the facility he uses. She needs to know.
On the other hand, getting cataract surgery is not optional, IMO - - it is needed, especially if she has one in her other eye too that is not as large but growing. You can't drive when your cataracts get bad enough, and eventually you can barely walk because you start running into things. I let mine go a long time out of fear, and got to that point. I think one would eventually become legally blind.
If her surgery costs too much for you to pay for it, you and she need to find some way for her to afford it. Maybe the doctor would do it as an act of charity. Maybe some charitable organization (Lighthouse for the Blind?) could at least point you in the right direction.
I was 67 when I had my cataract surgery, and with Medicare plus my insurance I did not pay one cent except for my share of the cost of the eyedrops, which was $142.50. I don't remember what they billed Medicare, but those numbers are probably all fictional anyway. Medicare pays what it is going to pay.
Once she has her surgery or surgeries done, she may need your help around the house now and then for a week or two, for things like grocery shopping, picking up heavy things (which isn't allowed for a while), being driven to appointments with her surgeon, and maybe even doing laundry. Frank was an absolute Godsend at that time, making sure I was resting and recovering and helping with the stuff I felt I couldn't or shouldn't do.