Yes. That means she is exercising too much and her body is declaring a crises. It's to protect her from pregnancy since her body has been tricked into crisis mode by excessive exercise. It's a genetic survival strategy for women during war or heavy predation. Once her body is no longer over stressed and appropriate nutrition/caloric intake is available (if it's not already) she will once again have her period. Many female Olympic athletes do not have their period. Many people incorrectly believe this is because of good health. Nope. It's a women's body adapting to high levels of stress which could be lethal to her and/or a pregnancy - should she become pregnant. Both pictures show you someone who is unhealthy. She is wavering between extremes. None of this should be conflated to mean that exercise is unhealthy. It absolutely is healthy and good for everyone. It's extremes which are not healthy. In this case, it's either excessive exercise and/or poor (or incomplete) nutrition.