My Stolen Genius, Her Fatal Copy

At her magical coronation, Lily is accused of stealing formations by her adopted sister Vivian, and her father strips away her powers before she is killed. She wakes up back on that same day with memories of what happened. Lily learns that Vivian can take and duplicate her magical formations, and she decides to use that ability against her. This time she prepares a trap, building a forbidden formation in her mind that Vivian will copy, one that could turn Vivian's borrowed talent into her downfall.