She is a widow who hoarder and most likely is loosing the various items because of the clutter. We live in a condo and the likelihood of a robbery at the front door isn't logical. She has progressively gotten worse since COVID. She lives alone, works parttime, has a dog. She also believes somebody comes in and feeds her dog things that make it through up and sick.
Quite honestly you cannot help other than to try to get help and intervention.
She is delusional, and only diagnosis and a safe placement can help behaviors such as this. You should report this poor woman for Adult Protective Services wellness checks and let them know what you know. If there are locksmiths who you know to be willing to give you a one page write up about their experience with this woman that may help. It is then up to the state to contact family (if there is family) or to decide upon diagnosis, prognosis, safety, the possiblity of treatment. Thanks for being such a good neighbor. Do know that her living in a condo with this level of impairment also represents a danger (fire and many other things) to other members of the condo. Condo management should be informed by APS or by you if there are continuing problems. What a tragedy this is.
Lots of mentally ill people work. It doesn't mean they don't need help, too.