Well, offing someone on the memorial trip would be a bit unsubtle, even for the



. Not to mention, she no doubt believed she'd committed the perfect murder right up until a few days before she was arrested when she realized she hadn't, but close enough.
I don't believe she felt the need to pack a gun and multiple knives for personal protection en route to wherever, especially since she'd already hid the gun so well out of sight that car rental peeps didn't find it when the car was returned. The knives? The



seems to have kept them handy as routinely as others do Kleenex.
I think she enjoyed killing Travis, and can easily believe she'd have had no problem whatsoever killing the next person who crossed her, and therefore packed accordingly.