For Kempe, being in such sacred places gives her a flood of emotions.  She has some pretty extreme reactions to these places.  Since she has her "cryings," her emotions are already wild.  She cannot control them, no matter how hard she tries.  When she visits these places she sobs and weeps so loud.  In these moments she truly cannot help herself.  This trip is not just about getting to her destination. The whole trip is her destination. Every stop along the way is important to her, and even when she is not in the presence of some sacred place, she still has the powerful emotions that she gets in those places.  She basically sobs the whole trip.  Her fellow pilgrims even get annoyed with her--"After she rode on an ass to Bethlehem, and when she came to the church and the crib where our Lord was born, she had great devotion, much conversing in her soul, and high spiritual comfort, with much weeping and sobbing, so that her fellow pilgrims would not let her eat in their company."

Mandeville writes about what he finds interesting in other cultures and religions.  They are all so different, and different intrigues most people.  Whether its a good or bad different, people like weird things.  When Mandeville writes about these things I think he intends to keep the readers interested, so he writes about some of the more extreme things he sees.