Board Thread:General Discussion/@comment-37047642-20180929103239/@comment-35284508-20180929170052

I am convinced that MT only goes through to flag (and in this case unflag) zombies occasionally. So an update to the friend's status may come later. Lilboops is correct in that MT looks at whether the 3 most recent event rooms have been opened and the icons that wander the paths on your board have nothing to do with whether that person is active. In addition MT only has activity status on players who play two or more locations at a time so someone who pops on, unlocks an event room and does little else might not catch their attention. That includes MT not seeing progress in xp or rep.

If she has a photo but not a game avatar then she logged on through FB and you may be able to reach her there. See if her name appears if you click on her icon (example below).. What you describe makes me ask if she changed devices or reinstalled and didn't ask MT  to move her friends over (or appeared as your friend but with a different name and avatar).

Overall I would not feel bad about dropping the zombie after doing what you can to find her.