The main thing to understand is that saturated fat is not evil. In the case of VCO, it is very, very good. And cholesterol is an antioxidant. Your body will produce as much as it needs to plaster over damage, regardless of how much cholesterol you eat, or how much fat you eat. The key is to eat in such a way that the damage is not occurring, or greatly reduced.
I would recommend you explore the website http://www.westonaprice.org and learn the truth about fat and coconut oil and cholesterol. This will help you know what to say to your mother.