On Sundays, Rachel usually drops into the Monster Shop (via the back door in the alley) to do the bookkeeppiinngg and to choose a new monster form to inhabit for the week. Then she usually goes back to her apartment and does some lighthouse work... wait... no, some light housework, getting a feel for her new form.
A closer look at the office wall in panel 2: https://www.weasyl.com/~kinkyturtle/submissions/1726857/rachel-s-office-wall
A closer look at that poster on the wall in panel 5: https://www.weasyl.com/~kinkyturtle/submissions/1726858/rachel-s-dinosaur-poster