Amita does not know how anyone can fail to notice the closed sign on the door, because it isn't as if they can exactly sell books when half of the books are in tub, and there is plywood on the window and leaks everywhere. How are you this completely oblivious to what is apparent to anyone with eyes?? She is polite with Moira, if a bit taut, until Moira knocks over a plastic tub of books, at which point a sigh escapes her but Moira is already gone, and likely is too oblivious to things under her nose to be aware of it anyway.
If anyone is volunteering to help her move books when Moira arrives, they will get to experience 'overly-cheerful because I am Pissed Off' Amita for the next twenty minutes or so.