My grandpa had a second wife like this. I feel your pain and have only terrible things to say.
Hopefully the police tell her to get lost and charge her for filing a false report or something. At the very least. Maybe someone can ask then how aunt b files for a court order to end the harassment?
After the Police figure out widow is a lying sack, make sure Aunt presses charges against her. Slander, false Police report or whatever someone who knows about these things can come up with.
I can't believe the Police are taking this seriously, really hope widow gets in BIG trouble for wasting time and resources.