Maiden’s Hope - OLI (2011)
Oldie, but I still like it.
The young woman is determined to find a cure for her ailing mother, but when hope seems to be lost, a unicorn takes notice of her selfless act. He gives his horn to the young woman as medicine for her mother, and she quickly recovers. The unicorn is drained of his magic, and cannot live without his horn.
Saddened by this situation, she gives him three of her beautiful, but rare flowers from her garden to him, expressing her gratitude. By a twist of fate, his horn magically returns, simply because a young girl showed him love and generosity. He returns the favor by granting the young girl a spell for her to see fantastical worlds beyond the natural realm.