My daughter is still wetting the bed, I am ready to give up, please help?

My daughter turned 4 in June, I have been potty training her during night time for almost 6 months now. Everynight I wake up every 2 hours and take her to the toilet. Sometimes I oversleep and by the time I wake up, she has already wet the bed. She doesnt even wake up, she sleeps with the wet clothes and linen. I have stopped any fluids after 5 in the afternoon, she goes to the loo before she goes to sleep. I am drained, waking up every two hours is really hectic, but how long is this going to go on like this, I am thinking now maybe she has got a bladder problem, I dont know, does anyone have any helpfull tips that I can try?