My theory is The father gave her a sword so that fl can protect herself and the ml (or the prince) save her because of the fl father's command but the fl misundertant it. So thats why fl use the sword to killed her life. Is so sad to think that the wepon use to commit suicide is the one that father give her.
Omgg im dying that so hottttt ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄