I had high choleseterol and high triglycerides and have written here in Curezone about my success of lowering it naturally.
It sounds as though your mom is doing a lot of healthy things.
Our body makes cholesterol as a healing agent for the tiny tears that undigested food creates. I think taking food enzymes with every meal really helped me. Juice fasting a couple of times also helped the healing process, giving the intestional tract a chance to heal.
I wrote about the many things that can be done daily to reduce cholesterol in the following post. You might find some ideas to investigate.
Your mom might like to use the Liver Flush protocol that I use. It's easy and I always pass stones even though I have a strictly healthy Diet and healthy life-style. The exact directions are listed at the end of this entry: