Cass, W did that when he started wearing undies. I forced a nappy back on him and told him if he was making no effort to use the potty he had to keep wearing them - he was dry from that day on lol
think I am totally going to have to start that with her! she knows she needs to wee, will stand with her legs akimbo in readiness and just lets rip ('cause she is a delicate little flower my Miss M lol).
but point blank refuses the nappy. might have to use it as the ultimate 'not a big girl' moment - as i mop up the floor lol.