I would say read as much of the recommended reading list at WAP as you can. They obviously are not all by the same author, so it wouldn't look like you got all your info from the same place.
The key to keeping your blood cholesterol levels balanced is to reduce inflammation. When arteries become inflamed or damaged in any way, cholesterol is sent into the blood to repair the damage, which is what the plaque deposits are. They are like bandaids to cover damaged tissue. Without cholesterol, you'd be in a lot of trouble because there would be no way to repair that damage.
The way to reduce inflammation is to strictly avoid sugar and trans fatty acids, and to add healing anti-inflammatory fats like cod liver oil and evening primrose. Also, some people are very sensitive to nightshade plants, so cutting down on your intake of those might help further reduce inflammation. If your mother is open to trying alternative medicine, a good ND would be able to recommend an herbal formula to suite her needs. We like to use Hawthorn for cardiovascular issues.