Made my daughter cry & hide

My youngest daughter was putting our soda away in the kitchen by herself and our son who was on the computer kept telling her to stop fake crying in the kitchen. He kept saying this so I decided to go out and see what was going on. When I went out I ddi not see her anywhere, but I heard her crying. I found her between the wall & the refridgerator crouched down with her face in her hands and facing towards the wall at the back of the fridge. I asked her what was wrong and she wouldn't say anything, all she did was cry. It took me a couple minutes, but with some coaching I got her to come out, but she was still crying. I had to calm her to find out why she was crying. After she calmed a little and I asked her what was wrong, she pointed towards the sink, then she said the curtain in the kitchen was moving and that she was touched while putting the soda in the fridge, heard people talking and that she seen a man wearing a mask. I don't know for sure what hse felt,heard & seen, but it was definetely something that acared her alot & made her cry & hide.