She's a neutral servant and there are 7 quests there where she's the main boss.
The NA version translated Neutral on the moral scale (i.e. Good/Neutral/Evil) as
Long-awaited, the rerun of the Fate/Grand Order x CCC SE.RA.PH event
5, Clear Act 8. 67. Defeat 10 Neutral Servants
Balanced refers to the unit 'alignment' - for example Spartacus and Emiya are Neutral balanced - Spartacus chills at Septem Harbour for 9ap ...
Complete all of this week's master missions. Defeat 3 Chaotic Servants. Defeat 3 Balanced Servants (True Neutral). Defeat 3 Evil Servants.
Emphasis on bonus servants and support casters.
This page contains a list of Servants with Neutral Alignment. It includes the Lawful Neutral, True Neutral, and Chaotic Neutral.
7, Defeat 15 Assassin-class enemies (excluding Servants and certain bosses)
The Garden of sinners - the Garden of Order introduced a Mission System which tasked players with defeating certain Servants with certain Alignments.