the problem i can see with that is if the little one really did in fact LET GO as you stated she could very well wipe one or both nations from the face of the planet seeing as how her magic skill makes her basically the boss of all bosses and lets not forget her massive strength as well which is nothing to scoff at so all in all our little munchkin packs more punch than even the great mage herself mainly due to how FAST she can learn a new spell and then instead of just throwing it back at you throw it back at you but 10X+ more damaging
We know that Anna train with Laura's father during the summer and I can't remember if Charlotte kept the power up during the ritual that she did before she fought against Laura and the tournament I know their teacher Emily is strong so I would like to see Charlotte train under her and I like to see Anna train under Laura's Father Again and I like to see Laura train under the Great Sage but you are right Laura can completely destroy a kingdom solo so I think it'll be more fun to see the other two girls cut loose why Laura watching the backgrounds
pretty much and no Charlotte did not keep that power because of how she gained it it took as MASSIVE toll on her body ie it was basically borrowed power . as for Char and Anna to me they are on the scale of a tank division for Anna and for Char she is a artillery division Laura all on her little own is an entire nations nuclear arsenal all rolled into ONE massive shot that funnily enough she can do OVER AND OVER AGAIN because her magic is so damned high that basically nothing really tires her out EXCEPT flight magic so really if you think about it she is all on her own like the us launching all of its nukes all at once over and over again in rapid succession meaning even in the long run the great mage herself would be outdone
It's always fun to see Laura Anna and Charlotte having kicking butt I would like to see the kingdom go to war with another kingdom and we get to see Laura Anna and Charlotte cut loose