Those of us, who have daughters and have bought them a doll in life, would agree to the statement that untangling a doll's hair can be a mess. Not only do you have your daughter standing right over your head, but there is also the added pressure of you fulfilling the expectations she has of you at doing the task at hand.
Now, nothing comes easily in life, which is why you would have to get off your seat and walk towards your living room to get a fabric softener. If you don't have one at home, then take the long walk to the nearest grocery store. When you have your hands on a fabric softener, just apply two tablespoons of it on the doll to see instant results. The tangle will be gone and your daughter will be super proud.