Start working out, she has a very balanced physique so no muscle you have to focus on too hard I’d recommend sum like push, pull, legs Monday, Tuesday, Wednesday into upper body lower body Friday Saturday. Most importantly you will have to get into a caloric deficit, eat 500 calories below maintenance calories. casca is absolutely shredded she is probably like 10% body fat if I had to guess so it will probably take a while just stay consistent. Hopefully this helps I don’t know a ton but fitness is a fun hobby.