Hi I'm not sure it's playing with yourself, spanking the monkey though you know better than I. By what you describe this is manifesting as perfectly normal. Not every child does this though there is a good chance either you or I did. At different stages the motive is pleasure as this act of pleasuring can begin even as a baby and then be picked up again. Children do not have negative associations that are programmed into us rest assured she will pick them up though. As it seems with your daughter, it is a discovery and fascination as she sees that certain people have certain holes and other people have well other devices. This is just normal self discovery. Most likely negative connotations will be picked up by her and prevail and she will become private or repressed with this activity as far as pleasure is concerned, as far as discovery she will be interested in the differences until she is satisfied and can realize that m/f are different in body parts, you should really realize negative reprimands will not stop any desire or interest and can be harmful on certain levels as it will drive or repress issues to a deep level that will need be dealt with. There is no sign of abuse your mind should not go there as far as a negative connotation.