a lot of strange things??????

all last week I had a lot of strange things happen. door open on its own shadows at end of my bed and sitting next too me, cups swinging on my cup holder etc anyway a good family friend came with her pendulum crystals and sourced where all the energy was. it was very strong in my sons room and she asked if they was any spirits in their. it told us after many questions that it was my great grandma watching over us and specifically my son which I did find a comfort. in no way did she say anyone who would like to come and join us etc so my question is since they was no invitation just asking if they was anyone with us she wont of invited anyone nasty over. am sure a would of known about it by now but just for piece of mind xx she also said that nothing felt horrible at all, am sure this is me just been a little paranoid as I am interested but so much has happenend I am still trying to get my head round it. many thanks xxx