Nutrition, strength, and conditioning programs for 19 year old female jockey who does extreme weight loss diets like fighters

The daughter of a co worker is a 19 year old jockey and exercise rider for thoroughbred racehorses. She is taking advice from older male jockeys and chose to do rapid weight loss right before a race rather than maintain a healthy, fit weight closer to her race weight. I’m looking for research or articles on the the impact this has on a young female body as well as articles with recommendations for nutrition and fitness programs specifically for female jockeys. This young lady is obstinate, part of what makes her good at what she does, but won’t listen to anyone when it comes to preparing and protecting her body for a long career. Anyone that has info or can point me toward resources would be greatly appreciated