@ phantom... i dont think its a bad advice... but in this case, 'futile' is the correct term...
e.g: she already copied your lightning shield magic; in most rpg that adopt commonly used elementals affinity, to counter lightning-based shield you'll need to use earth-based elemental attack/magic...
so, if rola use lightning shield magic, in order to break through her shield, you need to use earth magic... it will probably works, assuming rola's magic power is equal or slightly higher/lower than yours...
the one that can be called 'genius' power is around 100+ and rola's is 9999 (lets make it 10k for easy estimation)...
Condition: rola deploy a 10k power level of lightning-based shield...
Action: you will use a 100+ power level of earth-based magic to break her barrier...
Analogy: 10k power level vs 100 power level
Conclusion: Futility can also be described with you are trying to break a diamond with rubber hammer...
Solution: Best course of action and most logical action to take is just trying to catch rola off-guard with surprise attack from her blind spot...