Why does my daughter still wet the bed?

Dear Doctor, My 9-year-old daughter still wets the bed and I feel like she should have stopped by now. I do not give her anything to drink just before bed because I’m told that it will worsen the problem. But she still wets the bed almost every night. I even try waking her up every two or three hours to use the bathroom but somehow, that doesn’t help. How can I get her to stop? Is this normal?
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Dr. Rachna Pande