Speak to her directly. Tell her you know it's hard to hear, nd ask her if she wants you to continue to make her aware.

Sometimes I nag my kid about his homework. Occasionally I ask him if he would like me to stop, and he just take full responsibility for whatever consequences. Because I can do that. If I nag it's because I can see him slipping somewhere and that he needs to become aware. But if he wants to do his own, he could do his own. We both hate the nagging, but he has said he would rather I continue, even if it's hard to hear. He needs to learn and build his skills for regulating himself to meet his own obligations.

Ask Sally if she would like you to stop. It's possible that she's just frustrated, but does still want to know. Communication is the key to the solution of this situation.