Concentrating spiritual power was not a difficult task for someone who had reached the professor level, but the most essential condition—recalling happy memories—was somewhat troublesome.
Not everyone has cheerful and sunny things to recall, not everyone leads a happy life.
The more Turci tried to think of happy things, the more she remembered those incidents she'd rather forget, causing her focused spiritual power to scatter.
She couldn't use it at all.
Her negative emotions at this moment were even greater than when she was hit by a Feces Pot in the graveyard; she stomped her foot in anger and finally gave up trying to perform Expecto Patronum.
Once negative thoughts set in, it was not something that could be adjusted in a short period of time.
