Jaundice, red eyes, slight fevers, Insomnia. Quite a bit. But the Liver is one organ in the body that can rebuild itself. I have done it! All my levels are good now. Unless it's Liver cancer, I have some suggestions that will help the Liver. First, start taking Milk Thistle twice a day, up to a 1000mg's and find some Dandelion/Yarrow tea and drink two cups everyday after 3:00 PM when the Liver begins it's cleaning process. You might have to look for the Dandelion/Yarrow tea, but it's worth it. It works! Good luck! Try this stuff, a Natural Doctor told me and it worked, otherwise that person is looking at a slow death.
It wouldn't be possible to speculate on the expectations for your friend who has 15% liver function, because the exact effects are dependent on a number of other factors, including her overall health. Her liver is not working at full capacity and she may require medication, but it's up to the doctor to correctly assess the situation.