Disable the bars in console and input setstage TG08A 52
This is what finally worked for me. Using placeatme as suggested above didn't work, as I couldn't talk to her and she would just start walking away again.
I'm tempted to blame the "Amazing Follower Tweaks" mod, as I believe that's the only follower mod I'm using at the moment and this didn't happen the last time I did this questline when I was still using UFO.