C.G.
K., at her age she should definately be ready to potty train, and it sounds like you are having some success! YAY!! It's really hard to say why she won't go at the sitters, there might be something in the bathroom that makes her uneasy. Maybe you could go first, to show her there's nothing to be concerned about. My 3yr old had to have a stool to step up on for the longest time........she would refuse to let me put her up on the toilet!! We carried a fold-up step stool with us EVERYWHERE, I mean to Alaska and back!!!lol Now that she's tall enough, she can get up without one, in most cases. Good luck figureing it out, hoepfully it's just one small thing that you can get past and sail on through potty training!!
C. G