看来我找到答案了

The Princess was added to the game on 29/2/16 with the March 2016 Update.
On 23/3/16, a Balance Update decreased the Princess' hitpoints by 10%. Before the update, from level 5, the Princess could not be taken out by level 12 Arrows (and also she could not be taken out in Friendly Battles where the Legendary level cap was 1 and the common level cap was 8).
On 3/5/16, the May 2016 Update fixed the "range bug" and decreased the Princess' range to 9 (from 9.5) but her effective range is unchanged. The same update also changed her info text. Prior to this update, it read "Shoots a volley of flaming arrows halfway across the Arena. The Princess is afraid of germs, so keep the rabble away from her!"
On 24/8/16, a Balance Update decreased the Princess' area damage radius by 25%. She now has a 2 tile splash instead of a 2.5 tile splash.
On 6/5/19, a Balance Update increased the projectile speed of the Princess' arrows by 33%.

公主在2016年3月更新后于2016年2月29日加入游戏。2016年3月23日，一次平衡更新使公主的生命值降低了10%。升级前，从5级开始，公主不能被12级箭击垮（同时她也不能在传奇等级上限为1，普通等级上限为8的友军战斗中被击垮）。2016年5月3日的更新修正了“射程错误”，将公主的射程从9.5降到9，但有效射程不变。同样的更新也改变了她的信息文本。在更新之前，它写着“在竞技场的中间射出一串燃烧的箭。公主害怕细菌，所以不要让乌合之众靠近她！”16年8月24日，平衡更新使公主的区域伤害半径减少25%。她现在有一个2瓦片飞溅，而不是2.5瓦片飞溅。19年6月5日，平衡更新使公主箭的射速提高了33%。

恭喜