A girl who does not use toe pads and is working in significant pain will actually tend to become more fearful of working on pointe and as she is less comfortable it may take her a much longer time to progress. When dancers are confident going en pointe with little pain then they tend to progress more quickly. If you are experiencing pain then I would definitely look at addressing one of three things; either, your toes are curling inside your shoes which makes the knuckles rub against the inside of the shoe, the shoe may be too big which will cause you to sink/slide down in the shoe, or the shoe may be too small across the box causing the foot to be compressed. Usually one of these three things, if not all of them, will be causing the pain and addressing these issues will reduce the amount of pain your are experiencing en pointe.
I hope this helps!