I think the fact that Cinderella has the help of magic to help her reach her success does provide the possibility that she wouldn't have necessarily found success without the magic, because the things provided, by magic, to Cinderella are the things that helped her reach her success, through marriage, by getting her a husband who was her escape and path to success, aka a way out of her life path and into a life of riches. This is not to say that success isn't possible without magic just in the case of Cinderella it might not have happened, she escapes through marriage which was provided by the aspects provided by magic. In real life needless to say good things don't always happen to good people but you don't need riches in order to reach happiness, just like you don't need magic to reach riches, you can reach riches through hard work.
Relating to the movie and other aspects magic, riches and charm would all be helpful in order to reach success but they are not always provided in the real world, but they are al present in helping Cinderella reach success in this fairytale.
This picture shows the aspect of magic helping Cinderella reach the state which helps her to reach success through helping her into her marriage.