No, one year in jail will not be a cure to alcoholism. It may be a deterrent for a year, but that is all. I've heard people in the room, who have gone to prison for several years to a decade, and when they come out, they go right back to their addiction.
I have a couple DUI's myself, and I could have easily been in your daughter's position. However, I was fortunate enough to not have any accidents or incidents happen during my stops. If you want to be optimistic about the situation, this could be a blessing in disguise. It doesn't sound like your daughter killed or injured anyone, so it could always be worse. A year in jail could help her realize how serious alcoholism can be. I do believe that there are AA/NA panel groups that visit jails and prisons. It's basically AA/NA meetings but in jail.