How to go around a diet while living with someone who might be anorexic ?

Hey everyone, I believe the title itself explains the situation but to go further into detail I'm (18f) am attempting to go back into a cut as a large gym rat who has been eating 4 ramen packets a day during final season. I have went on cuts numerous times before for body building but I have grown a small suspicion that my younger sister (14) might be struggling with her relationship with food. We are currently observing her and trying to support her while not directly accusing her because she will shut down directly if we do. Would it be a bad idea to continue with my diet plan, would it cause her possible issues to get worse? Additional context: When I cut I eat 3 meals a day, and try to live normally. But I do switch out my usual option for lower fat ones and don't partake in eating out during that time. I attempt to portray healthy dieting to my siblings even before the assumption.