She needed to be trained to become well rounded, she was just a judo expert and the game evolved beyond her.
I know a local level 125 lbs MMA lad who'd smoke Josh Warrington etc. It's next level conditioning training wrestling, bjj, boxing and kickboxing everyday. Boxing training is a breeze in comparison. Probably why Ngannou wants to stick to it.
But elite boxers are more skilled with their hands than any MMA fighters, no MMA fighter could touch Bud Crawford in a boxing ring and Usyk trains harder than any combat sportsman.
it is harder on the body to train mma. So many techniques to choose from and perfect. boxing is harder to become champ because they are less accepting of losses. No room to grow in boxing like mma. so it's hard to say cause boxers often need 25+ matches before a title shot, even if it's cans in the first 15 fights. mma guys can become a champ with 10-15 fights on some occasions.