Thank you for the feedback. I never really considered the fact that she's being arrested and would therefore be less willing to be escorted out. More just the overall mechanic of following, even if being arrested I should be able to walk normally, which is what I was doing, and have the NPC mostly keep up. Was irritating that she'd follow 2-3 steps, stop, and ask for help. I finally got the quest completed took some patience to get her down all 4 floors, dismissed all minions, entering and exiting the elevators until she caught up with me.
As for my build I'm MM (Necro) / DM. I figured the pets got in the way a bunch and that didnt help with the following at all. No idea why I said dominator, that's an entirely different power set.
Thank you again.