Your DD sounds like my 2 1/2 year old, very interested in sitting on the potty, loves wearing pants but is saving her wees and poos for sleep time when the nappy is on. I'm hoping if I keep encouraging her that she will eventually want to use the potty or toilet rather then holding it until her nappy is on. My DD will wear pants all morning while at home without any accidents but then does it in her nappy during her arvo nap, even though we've put her on the toilet numerous times in the morning.