I'll admit that my understanding of the Jungian functions is very limited, but I have a small grasp on them. I just get confused with similar functions. Anyway, she was probably told by someone that S types assume too much and believed them. I would say assuming too much may be a characteristic of IxxP's in general, since they use dominant Ji. Ti and Fi are, at least in my mind, the most idealistic of functions since they claim either logic or ethics "in a vacuum" so to speak. This is cool in some ways, but slightly annoying sometimes, as they often forget to expand their judgments into the realistic, outer world that they actually live in. You tend to get a lot of arbitrary ethics or theoretical nonsense without any grip on reality, unless the tertiary Je is developed well. Although secondary Pi can aid in balance as well. Make sense?