Finally and literally got to the root of the problem as to why our 6-year old calathea plant was feeling the blues; her soil was water-logged (what looked like clumpy clay was mixed in her soil mix) and her roots had started to rot.

So we spent the better part of the afternoon splitting her in two, repotting two other indoor plants that I got as gifts as well as an olive tree that I got for myself as a New Year gift.