Zara has made up her mind to approach Ardilo. She is confident with her visuals that are not inferior to Taera. She can also judge Taera as a person from her chat when it is the day. Zara can also understand that Ardilo seems easy to approach as long as the girl he is close to can make him comfortable and close like a friend.
Zara knows very well how Serry and Ardilo were close as friends back then. Ardilo is very caring and defends Serry even when he is already dating Taera. Zara can conclude that Ardilo still can't distinguish the boundaries of friendship and courtship. It became his weak point which she could put to good use.