It may not mean kidney damage per se. What could have happened is that the Liver Flush has put a heavier load if you will on the kidneys as toxins are released.
Has your daughter done anything to help gher kidneys process all this stuff yet? Beyond the tea, might I recommend Dr. Sculze's kidney flush?
No matter what the reason the protein levels are elevated, this flush will help the kidneys function better and help them remove waste so as not to get overburdened. In the future, it is good to get optimal kidney function before doing the liver flush.