"is that for otherwise healthy people and is it safe for someone majorly debilitated and toxic"
There is no way we can guarantee any safety for her; as we only have our own experience with Iodine to demonstrate and share with you.
-but I can guarantee it is a lot safer than toxic mold and sewer gas.
If she go through with it she will probably have a detox phase that is not pleasant. I would recommend to do ALL the companions, do not skip any steps.