I think that's a vaguer and more ambiguous issue than the Mysterio thing...which the longer she delays, the more the god of plot decrees it will blow...
On the one hand, Tom King (haven't read Up in the Sky, but he seems antithetical to a Supergirl book), on the other...Bliquis Evely. Not sure how to...
I mean, I'm not arguing against darker stories just that King seems to take characters I like (Booster Gold, Wally, Kyle, Mr. Miracle, Adam Strange)...