We spent a whole week at home wearing nothing from the waist down. For some reason with her if I put panties on her she felt like she was wearing something so she could just go in them. Once I made her go nakie she realized she needed to run to the potty to go.
She's doing fabulously now. We occasionally have a miss with #2 when she gets a little stopped up, but other than that she is peeing and pooping in the big girl potty like a pro.
Hooray for big girl underoos!