Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
Third Person Limited
It can be weird to hear Kempe referred to as "this creature" in the text, but that's exactly what she does. The term is not meant to dehumanize her. Rather, it's an acknowledgement of Margery Kempe as a created being under the sovereignty of God. If there's any debasement meant in the term, it is certainly in the humility that Kempe feels as a penitent sinner. In any case, the use of third person here is meant to replace her first-person point of view, but it's still limited to what Kempe perceives, or to what God tells her.