I am a commercial real estate manager and leasing agent and unless there is a lease in place or the current public ownership is mrs. klipsch, she has no rights to the building what so ever. Mrs. Klipsch may have items in the building that belong to her and she has rights to those personal items. Changing the locks is called a commercial lockout and is usually afforded to the owner as a right in a lease as a means of landlord remedy when a tenant defaults and does not remedy. This means the owner has taken repossession. The owner can usually sell the items within that are that of the tenants but items belonging to others get into a grey area. This is known as damage mitigation here the owner can try to make up monies lost due to breach of contract. Mrs. Klipsch would have to somehow prove that the items in the museum are actually hers. Most of the time, an owner does not want to pay to have others peoples items removed and would rather the tenant removes it themselves. An owner especially doesn't want to get in the middle of selling others items potentially and it is wise to consult with a 3rd party company to ensure that the sale goes properly to remove liability from the owner.
Mrs. Klipschs attorney could try to swing a "sweat equity" type deal and prove that she has some kind of ownership but she would most likely receive a monetary settlement if anything at all. This is purely speculation and would be a lot to physically prove.
I am basing this on AZ revised statutes for the most part. I understand that real estate laws vary by state but what i am talking about is pretty basic stuff. Things obviously go deeper if she has retained an attorney. If a commercial lease exists, all of the rules of the game are laid out within that. Here in AZ, there are very few laws that exist for commercial, most of the rules and "laws" are written within the lease itself. Residential is 100% different where the state usually has a landlord tenant act written up which is a huge guide to be followed plus those rules setup within a lease that can't and shouldn't contradict law unless there are situations where it allowed.