I have a brother who wet his bed as long as I remember. As far as I know he still does. My mom used the alarm pad, it didn't work. She tried getting him up early and he would pee in bed after being woke up. She also tried repeated wakeups wich worked but my mom eventually decided he needed to get up on his own. That didn't work. Mostly we think he is a hard sleeper and too lazy to getup. I don't know if that's a good assessment. I don't think most bedwetters are lazy, I think it's more likely some other underlying problem.
I stopped wetting the bed when I was about 7. It was very embarrassing, and my mom was pretty mean about it (which could contribute to my brother still wetting.) She would ask me why I kept peeing and I would tell her that I couldn't feel it. She never believed me, insisted I was just lazy, but I really couldn't feel it. I did out grow it. Probably more out of fear then anything. I remember having a couple accidents even after I was 7 and I would get up as soon as it happened and put the bedding in the wash and change sheets before anyone got up. I didn't want my mom to find out. It really is emabarrassing to have a weting problem.
Like many others said I would have her take some counseling. Try to find out if anything is causing it, or if it's something else. Just don't be mean about it, it's emabarrassing enough just having a wetting problem.