Where the hell are they? I picked up Veronica, went to the Mojave Outpost, then told her to go to the Lucky 38 so I could snag Cass. Now I'm at the Lucky 38 and I can't find her anywhere. They're only supposed to be able to go to the suite, but I checked the casino floor, cocktail lounge, and just outside the building as well. She has my Great Khan disguise...

There is a chance that she didn't make it to the lucky 38, she might've gotten herself killed along the way. If you don't want that kind of thing to happen, tell them to go to the 38 while you're in vegas.

Companions take far longer to travel by themselves than you can fast travel. They only walk.

I told Veronica to go to the lucky 38 and she just sat at the entrance to The Fort. Didn't move for the rest of the game. Not really an issue since I never picked her up again, but still.