I would still research the house or property a bit harder. I think you said in your first post that the landlord did same there had been some strange things but they could not remember? Are there any neighbors that have been there for a long time and might remember previous renters? Real estate agency's in town might know. They are very careful to hide this kind of stuff b/c it can make the property hard to sell. We sold a house once that was definitely haunted , or whatever you wish to call it. I told the agent and she said to keep it quiet or they'd never be able to sell it. I found out the new owners moved out after a year. The house has had multiple owners since then.
We had an issue with our home once and I consulted a shaman . They told me to just go talk to the spirits ( as I thought I knew who it was) and tell them they were deceased and help them to move on. They also advised the sage and all that. They also advised a house blessing. You can google that and find out what is done.
I also think that if it is in any way possible that Ali may not be getting enough oxygen to her brain, via heart condition, she might be doing things and forgetting them. It is not unheard of. From your description it does not sound like that is what is happening, but worth consideration.
Lastly ask, Why now? What is happening now that would cause someone to try and scare Ali into moving ? Why would the spirits ( if there are any) be bothering Ali now? I always ask that question, Why Now?
As all have suggested, try and find a logical reason, a human reason this could happen. After that , then look for the unusual. It would not hurt to just talk to the spirit, if there is one, and tell them they are deceased and frightening you. If nothing else it might make Ali feel better.