And, half of the directives relating to Apeiron are built on top of the results from Amy's debrief after the heal-n-chat session.
As Director Armstrong has noted, in order to roll back the Directorial Decrees, Piggot needs to be able to justify both why they were initially put in place — fairly easy — but also why they are no longer deemed as necessary.
Which Carol Dallon is blocking at every turn, because it would mean admitting that Vicky isn't her darling perfect princess, and that Amy might sometimes have been a victim rather than an evil supervillain-in-waiting. (Go re-read the "Meeting Report" addendum on Chapter
37 for examples)
Until Brandish gets shut down (preferably hard), Piggot can't get the additional evaluations & confirmations she needs to be able to say "initial response was caused by a false-positive that we have now confirmed was caused by long-term exposure to Glory Girl's aura". Which means the checks & balances in place to prevent frivolous use of these Decrees are blocking her from being able to repeal them.
Nope; medical reasons, after Circus stabbed her. She even stayed on in an advisory role to assist Tagg after Calvert 'went missing'.
A lot of focus gets put by fans on Piggot's reactions to the capes abandoning the PRT teams during the Ellisburg Incursion. However, what often gets overlooked is the (quite important) last two lines of that interlude — when she's just found out that Calvert shot his superior officer for "not climbing the ladder fast enough", and that Calvert wishes he had powers, because he thinks that power would let him choose which rules do or do not apply to him.
She amends her previous thoughts about how bad capes are, to acknowledge that non-capes can be just as bad. And then she runs a department full of military/law-enforcement themed-or-trained capes such as Miss Militia and Velocity; people who have had the training & discipline for crisis situations that normal capes lack.