J.B.
Please, continue to be patient and don't use any of these shaming techniques! It could be extremely detrimental to her emotional well-being if you tell her that she's yucky or a baby for pooping in her pants. :( However, I do think it can be helpful to tell her that it feels better to go in the potty than have it in her pants and get all dirty. She needs to have the desire to go potty, the intrinsic motivation. I think that both punishments and rewards will set you back on this.
Also, next fall is a long time off. :)