A: Sorry to hear about your situation and hers. You might be able to get a guardianship over her and then make care decisions. You could also, after giving proper notice, go through the eviction process. Either way, you will need to consult with your own attorney. Good luck.
A: Chances are good that unless you or your brother or someone else care enough to apply for a guardianship or custodianship over her, there's not much that can be done to prevent her from having a rough life. You might want to talk with a local attorney about persuading her to come out to visit and seeking guardianship locally. Good luck.
A: You might want to bring a claim against the property owner himself and let him pick the fights with the insurance company. Given that this was a residential tenancy, you might be entitled to your attorney fees as well as statutory damages. Good luck.