If so they never actually addressed it on paper.
From what we saw of that story arc was that she gets angry at her armor for refusing to respond to anything she does, she bangs on it in anger, and it responds by exploding to pieces.
They never actually addressed how she managed to regain control of it.
Personally, My head canon is that it has to do with Logan's death.
In that story between her and Hellion, she mentions that when Logan died, she felt his death in the same way she did when other members of her family died.
And its the first story following logan's death where she has control of her armor again.
Maybe that experience kinda rebooted her connection to her power.
But that's just my theory.
Edit:
I was talking more about how the whole point of the school was to keep students out of fights instead of sending them to fight threats (that's what the teachers as suppose to do).
In this case, the "students" are clearly training TO be involved in the fight (Kitty is even taking them on such a mission in issue 1).
So its a different situation.