Be careful that she isn't dehydrated.
Do you have a glucometer? The symptoms you describe can be from low blood sugar.
All of the symptoms described are part of an adrenal crisis, which can be brought on by the added stress of a herx if you have adrenal insufficiency.
I can't remember if she has mentioned adrenal problems or not.
If your sister has or has suspected adrenal problems then you need to take her to the hospital immediately and tell them that she may have adrenal insufficiency.
If they are caused by adrenal problems the symptoms you described are very dangerous and can lead to coma and death if not treated with IV fluids and steroids.
Don't know if this helps, God Bless,
Paulette