R.,
Thank you for asking the question! I am having exactly the same problem with my daughter. You described our situation
to a T! And thank you to all of the people who responded!
I have tried putting my daughter back in pull-ups, but she likes having me lay her down and change her too much, so I went back to panties because she really doesn't like have poop in her panties and she gets upset about it, but keeps doing it.
I was given another suggestion by a friend which I haven't tried because I know that it will require more work for me, but I think I am getting to the point where I will try anything: Make her clean it up! I know my daughter will try to clean it up and she will probably make an even bigger mess in doing so, but she wont like it so it might work! I will then have to go back and clean up after her, but hopefully it will mean fewer clean-ups in the future.
Good luck! Let me know if you find anything that works and I will do the same for you!
D. and Layla