Reborn as a Mage Battery [OP MC, Progression Fantasy]

Reborn under purple skies on a small farm full of love and life, Mira believed she had been given a heavenly second chance. Instead, she is evaluated at four years old and declared an S-Tier magical anomaly. Too much mana. Not enough control.  A power source that can sustain the Kingdom’s defences—or destroy them.  To some, a battery, To others, a weapon.  In a kingdom that measures people by their utility, Mira must prove she's more than what they want to turn her into— before they decide she's more useful bound than free.