A cute girl has insane RNG luck and discovered most of her OP stuff by chance. Most comments here are people griping that the game doesn't work like actual MMOs which granted it does seem somewhat unbalanced but her shield eats all of the magical attacks thrown at it and she got some OP skills, her items and stupid def are clear answers to that. not to mention the game in this world is rather new so that tournament was probably full of people her level that were still clueless and never got god tier gear. Still only at 4 chapters so I'm sure some OP dps builds will appear eventually for her to struggle against, her gear looks fucking awesome as well.
To sum it up a cute airheaded girl got some legendary RNG drops and pulls while most people are still early game scrubs, she's doing it right.