Jenelle Salazar is a pretty unique type of fitness celebrity. Her videos are mostly centered on providing information to her fans about unique and one of a kind exercises that Jenelle comes up with on her own. Obviously, her exercises are effective, as otherwise, she wouldn't be having 576,000 followers on her Instagram profile. Just looking at her ab definition shows that she is serious about her workouts.
Her recommended workouts are strength training (via weightlifting and whole body workouts), as well as kickboxing. Judging by the size and definition of her abs, Jenelle is obviously keeping a clean diet, but she does try to keep a high protein intake on her workout days. For optimal muscle gains, you can either try to use whey protein or if you want to save money, you can consume animal-based proteins (like sardines, chicken, and eggs).