The hell? Her bounty came out when it was unfrozen following the dissolution of the Warlord system, not because of what happened here, which happened after the bounty came out. Its so high because it accounts for 14 years or so of gain (shes been a warlord for a long time). She is absolutely not stronger than any YC1. Luffy right out of the timeskip crushes her, and he was significantly weaker than Katakuri.