Interesting they haven’t yet chosen to share how they came by the additional info (car, weapon and aliases).
I am sort of guessing that people came forward who sold her the car. If they had caught it on camera, seems like they would give us a direction or region to look in. I bet there are people sifting through surveillance footage for orange cars in a back room somewhere.
Maybe she has the rifle registered to her name or there’s just one missing from the jail. Or someone came forward who sold it to them.
For the aliases, maybe she signed documents with these names or used them in person when she purchased items.
Hope they release more soon!