I would.Took them a week to ID her
Its not like this was a hidden assassination
I would hardly call that "fast"
Generally murderers who plot their crimes try to cover their tracks.
My guess is that the cops had cctv footage of him getting killed so they knew it was a Uhaul van.
Next, they ask the firm for the names of all its clients in the last couple of years, and the names of those they were suing.
Now a simple cross check.
Bingo, they have a hit on her name.
Then they zero in on her.
Or maybe even simpler, cctv cameras capture a shot of her driving the van.
There are cameras everywhere these days. Absolutely everywhere. From every cell phone to every commercial building to door bells.