OT: Baby/Toddler won't keep diaper on...

Help! My 19mo takes all her clothes and diaper off everytime we lay her down for a nap or bedtime. She then either flings the wet/dirty diaper somewhere or makes a mess in her crib. PULL ups worked for a short time, but she has figured those out. We have also tried one peice jammies and turtleneck onsies with pants over. This girl can get out of anything!:moped: We had started putting tape over the tabs of the diaper and even tried duct tape with no success! :confused: Did I mention she thinks it is funny!:woohoo: If she has the diaper handy she will even throw it at you when you come in the room...and she has pretty good aim!:arrow: We have considered trying to potty train her...but I'm not sure she is ready and I'm not ready to push too hard. I'm getting tired of giving baths and washing blankets/sheets/and clothes 3 times every day.:confused: Suggestions anyone???