Thanks for the information.
Let me try to explain you in detail.
When a retina detaches, the intervention in the form of the surgery has to be done as soon as possible. As time goes on, there is fibrosis (reaction) and scarring which makes the surgery difficult, more chances of re-detachment even after surgery and a very poor vision prognosis.
In your mother's case, this is not a plain retinal detachment
. She had posterior uveitis
, which itself causes inflammatory reaction and an abnormal scarred retina. Such a retina is very fragile. During surgery, there are chances that the retina can get further shredded. Also, there are chances of increased uveitis or inflammation after surgery, thus complicating matters further. Last of all there would be hardly any vision potential left because of the complicated case (i.e. post uveitis) and the fact the detachment is 6 months old.
I an understand your frustration. But a complicated retina detachment surgery is not easy to perform, has more risk of potential complications and in the end the vision might not be worth the number of surgeries.
At present she needs to be always careful about her other eye. She practically has only one eye to rely on. She should get regular eye check ups so that any sign of problems like cataract, uveitis can be picked up fast and treated.