Since you've already seen a doctor about your daughter's incontinence and he or she has diagnosed the condition, I would recommend that you continue speaking to the doctor for assistance with how to now manage the problem. The doctor may be able to recommend some form of treatment (perhaps an exercise program), so that eventually your daughter may strengthen her sphincter, lessening the problem.   In the meantime, I would recommend using absorbent products (diapers). Your doctor may be able to recommend some good brands of products to try. Just as someone with a bad shoulder may need to use a sling for their arm, or with a bad knee may need to use a knee brace, the absorbent products are a medical aid designed to help with a weakened sphincter muscle.   Cribs are designed to keep toddlers and infants safely confined to a bed during times when they are supposed to be sleeping. Assuming your daughter's safety isn't in question, there is absolutely no reason why she should be put into a crib. She needs to be treated just as any other nine year old with a medical problem - the medical problem alone needs to be fixed and helped, and needs to be reassured that it is not her fault and she should not feel guilty or ashamed about it.   If you're concerned about her bedding getting wet, simply invest in some waterproof mattress pads.