Tie Linglong's preparatory work could be considered as very successful for an assassination.
She had escaped from the Dragon King's residence on the second day after his departure from Jade City. She disguised herself as a teenage slave and sneaked into a merchant caravan heading to Xiaoyao Lake. She was hiding close to the Dragon King for many days but had never been discovered.
She continued to lie low when they had arrived in the Stone Kingdom, and it was during this time that she had gone to the royal palace to conduct some reconnaissance on the princess. As such, she had some preliminary understanding of the daily habits of the princess.
"If the Dragon King does not manage to marry the princess, I won't have to do anything," she thought.
On the day of the actual voting, she knew that the Dragon King would eventually be declared the winner of the entire competition. Therefore, she decided to make her move.