wraith wrangler, any history of the place where this happened? So you have seen some things happen after this incident?
What you might have seen while cooking pizza rolls, sounds a little more creepy than shadow people though. That is just my opinion. If you see it again though, don't let it "beat" you. Just ignore. I have my reasons for believing that, but not gonna go into that now.
As far as the pic of you moms sister, your aunt I guess, that is weird what your mom experienced, but it is not unheard of. I think our deceased loved ones give us subtle signs once in awhile that they could still be with us in a way. Not to say that a picture that you mom had never seen before floated down before her was exactly subtle.
Sounds to me that perhaps your mom's sis was just trying to pass along a hello. A weird hello, but a hello just the same. Maybe your mom had been thinking a lot about her sister at the time this laundry incident picture happened. Who knows? What was you mom's reaction to that?