"No, not yet. Too soon. I must think"
-Sheila recongnises that even though the inspector is gone they all need to consider the impact of their selfish actions. She is the Inspectors biggest ally.
-This represents the generational divide that the younger generation will be the future of society which mirrors the views of Priestly. He is sending a message through Sheila.
-However, it also implies that if enough time passes she will take him back as it was likely her best option in 1912 otherwise she would be left with no power.