-So we have asked the foreign ministry in Sri Lanka to contact Bahrain officials and get a response from them (any response really - yes, a police report can be somehow obtained or, no, there is no possibility) as that is one thing the US embassy is probably looking for
-The destructive fire was due to riots that were taking place in 1983 in Sri Lanka. So we are getting a letter from a notarized justice of peace verifying my mother is one of the people who lost everything during the riots.
-I am also looking into contacting the congressman in our area.
-We are also trying to get some advice from an immigration lawyer either in the US or Sri Lanka. The lawyer's appointment is next week in the US.
I'm just noting all this here for anyone who might face the same situation in the future. I will keep this thread updated on the progress.