After handing evidence to the NCR, I decided to flip the quest result and get both reward perks for Cass by killing the two women responsible for her problems in the first place. First stop, the Silver Rush. As soon as I stepped into Freeside, the street crier for the pew-pew store opened fire. He died, set on fire by ED-E. Then I sniped the Silver Rush's door guard, Simon. That led to an intense street battle as several Van Graff guards ran from the store, firing enough beamguns that... it didn't look all out of place being New Vegas at all. I kept firing on them with my rifle, ED-E with its laser, while Cass shelled them with Annabelle until she ran out of ammo. The guards dead, I entered the shop to deal with the owner, Gloria Van Graff.
...Except that immediately charging into one of the most heavily fortified places in the Mojave, a place known for A)its beamy guns, B)guards fully trained in said beamy guns, C)everyone inside the store being a complete and total asshole, and D)every one of those assholes is very pissed off at me, right after a street shootout with more of them with all the damage I just took... well that wasn't a great idea, was it? Poor Cass, they focused on her first.
Fallout New Vegas. They never actually patched out the ability to get both of Cass' reward perks, did they? The wiki says they didn't.