I'll bet this has something to do with phone pings, text messages, or phone calls coming from or going to that residence. Enough time has elapsed that they should've been able to obtain the phone records for her phone, even though it was a burner or pay-as-you-go phone. Factor in the amount of time it takes to show probable cause and get a warrant signed.
Of course it could also hinge around something as innocuous as a fingerprint.
I revised the map to show the location of Berkley, basically the center of town. It looks like the blocks are laid out in one mile square grids, so counting distance from her work and home is fairly easy, just count the squares. I don't know exactly where this search was conducted, so for now we'll have to work off of the center of town. I will revise the map if further info. becomes available.
Map here: Search location shows up as item #4 on the menu.
https://drive.google.com/open?id=1FcxtCIpiqWLhJB3e-0oIN__jbBU&usp=sharing