I believe my best friend's house is haunted

Hello everyone,

I am new to this so I am going to try my best here. I believe my best friend's house is haunted. There are times I am over there and we hear knocking on the floor where her bedroom is. It's always at the same time every night, the doorknobs will rattle like someone is trying to get in, the doors will swing open and no one is there. We hear footsteps going up and down the stairs, she has become extremely depressed, she's suffering severe anxiety ect. I have known her for 12 years and this is not her. Is there anyway to get rid of this thing? It is causing emotional harm and was as physical. Her husbands health has been declining ever since they moved in and he has seen a shadow of this entity. I was curious as to your thoughts a bout this thing. I have saged the house and there hasn't been any change. I am going to be visiting her this weekend and I thought maybe sprinkling water in the corner of her home and my other best friend sageing at the same time then throwing the water from the bowl out the window may do the trick? Thank you.

When I wrote corner of her house I meant corners haha

it's a cat

Plenty of clean, orden, sun and air in all house , they seek the "dark" and Take Ownership (not only physical, of all spaces in the house). Mopping the floor with salt and wine vinegar, rue burn and put in each room a big jar with vinegar.