First off, her Free T4 is very
low in the range, indicating that her
thyroid is not producing adequate
thyroid hormones. Rule of thumb is for Free T4 to be about mid range; your sister's Free T4 is only at 13% of its range, so it's quite understandable why she has symptoms of being hypo...
Unfortunately, Total T3 is considered obsolete and isn't very useful, but it, too, is lower in the range than we'd recommend...