A Concerned Child Seeking Advice About a Parent's Actions

Assalamu alaikum, everyone. My dear mother is 48 years old, and she has been a widow for 4 years now. I love her more than anything in this world-she is a wonderful mother who takes care of us, corrects us when necessary, and always supports us. However, she can be quite trusting and often believes things she comes across online. Just today, she insisted on cleaning the floors with a mix of salt water and vinegar, claiming it would ward off jinn. When I gently mentioned that this belief might not be correct, she became defensive, saying she knows more than I do. I do believe she has more knowledge of our Deen than I do, but I'm unsure how to address it when she makes such mistakes. Any advice would be appreciated. Jazakum Allahu khairan.