Oh yes, Shadowing ........ creeping up behind you ...........
I would be sitting at my computer, bashing away when I would get "that feeling" and find her behind me, watching intently ........ never heard her come up the stairs ... she was always quiet ........
Or washing the dishes........ again, behind me ......... I would turn around and say "hello there!"

and she would smile, watch me a bit longer, then meander downstairs again .....
She had her prime place in the loungeroom, she could see almost everything from there, and if she saw us duck through our doorway, would get up and check on us and 'hover'.
And I would often hear her chattering away to nobody in particular ....... in the kitchen, in the dining room, ALWAYS in her bedroom ....... and it never sounded like happy chatter either .....we would hear swear words (from my british upper crust MIL? OMG !!

) and find her pulling things apart or moving things around. She started going through everything .. drawers, cupboards ... you name it, she went through it with great detail and worry.
Just another foible of our charges.
Hugs
Sally