How to potty train with a diaper?

It wouldn't be any different to use a pull-up than to use a diaper. If you really want to potty train and she is showing signs of readiness just get her some training underpants. If you want to use the pull ups it would be a little easier than the way you are doing it now with the diaper because you can pull them up and down like underwear and you can rip the sides if she does have an accident.