Higher cholesterol level is only an indication that she really
need Liver Flush badly.
It is not, in any way, increasing the risk of encountering any problem when doing liver flush.
The only serious risk, if any, for Liver Flush would be an extra large calcified gallstone, possibly with very sharp edges, and people who has such Gallstones are rare.
All the other people, and that could as well be over 99% can safely flush liver every few weeks or every few days or every few months, depend on needs. You stop flushing very often once your liver is stones-free.