UHM SOMEONE HELP ME

so i have a crush on a girl but shes str8(pain) but it doesnt matter rn bcz what my current concern is the one she likes is 3 years older than her SHES A FOOKIN MINOR shes the same age as me (15) lmfao i rlly wanna tell her that shes should stop seeing this guy because shes being groomed but i dont know how to tell her without her getting mad at me she even shared a post quoting "If i like you i dont care abt how old r you" its really concerning, i rlly wanna help her but im afraid since its been like 3months since the last time we talked to each other