I think the high points here have already been covered, but you might also want to discuss this with your Mom's doctor. He may be able to provide info to the police (as long as doctor-patient confidentially is not an issue) to help in your case.
Yes, definitely go in person, and try not to get too emotional (easier said than done). Be calm.
Please let us all know how things turn out.
Good luck. Sorry about your Mom.
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