my daughter and I are the only ones home. I put her down on her little seat thingy so I could go to…

my daughter and I are the only ones home. I put her down on her little seat thingy so I could go to the bathroom. my house is old and even if you are tiny the whole house shakes every time you take a step. after I got into the bathroom and stopped walking to close the door I heard more house shaking footsteps and a door close.... the house small and standing in the hall, of all the other doors in the house are open, you can see in every room. no one is here. and now my 2 month old is cooing and laughing..... I'm still in the bathroom