It IS frustrating, isn't it. I had the same thing with my girl (now 12) at the exact same age. She was dry at night for a year and then started wetting nearly EVERY night. I took her to the pediatrician after a few weeks and nothing was medically wrong (always good to check that out first). I tried limiting liquids (didn't work), waking her in the middle of the night (didn't work), changing bedtime routine (didn't work), I even moved her to a different bedroom (I thought maybe she could hear water running in her sleep and that was causing it - didn't work). Frustrated, I took her BACK to the pediatrician to see what could be done. Her pediatrician sat me down and said "she isn't going to get married and still be wetting the bed, she isn't going to be going to college and still be wetting the bed, she'll grow out of it when she is ready - quit sweating the small stuff! Best advice I ever got. I put plastic on her bed under the sheet and had her wear Goodnights (or the equivalent) every night and forgot about it. A couple of other thoughts that may be helpful. Some kids are supposedly more "prone" to bedwetting than others: kids who snore, kids who had a parent that wet the bed longer than "normal," kids who are really heavy sleepers, and kids who are big for their age. My kid fit all those criteria to a tee. There are a few things that did sorta "help": I did try an alarm when she was older. I did help, but short-term. It would go off the first few nights, then she would stop for a week or two so we would stop using the alarm, then it would start up again. Sleepovers were a concern and what seemed to help was giving her a 1/2 dose of Benedryl before bedtime at a sleepover almost always kept her dry for the night (this was before Goodnights were really "good" at being more like underwear).
Moral of the story is: she WILL outgrow it eventually - work on making it as stress free as possible for both of you until she does :)
Good luck!