There's a bit of a delay for the online/offline dot to change after you log in or out. It's been like that ever since it was implemented, I wouldn't worry about it too much.
You know, we lock when we lock. You asking for a thread to be left unlocked does not leave it unlocked if we think it should be locked. You asking for us to lock it, only happens if the thread is - finished.
But since Carlie is busy with her exams and life in general these days, asking her via her profile is a MUCH better way of getting her to see something.
And the thread is kinda finished. With the usual "it's a glitch, we hope they'll solve it".