Did she lose her sight in that eye? My sister in law had shingles a couple of years ago and she went to the doctor right away and they gave her medication for it and it cleared up in a week, the key with shingles is both early detection and treatment, people put off going to the doctor.
In my case I got screwed by the local emergency room. They were clear off track, and by the time I made it to my doc a couple days later, she said I might as well skip the antiviral meds 72 hours is the "window"