Penelope can change herself, but not in the traditional sense. She tosses the baby powder and diaper up into the air, then does a hand stand, where the powder and diaper land on her bum. Then she simply fastens the straps with her feet (Her legs are very flexable). This is the kinda thing a babyfur like me would pay money to see. All the male diapered Veemons out there are probably turned on by this. They're all like "Helllllooo Penelope". Anyway, this costs a lot of her strength and she has to rest for at least an hour afterwards, as you can see in the last panel.