Does the Iron Flask let you Order the Creature Back in Without a Save?

So I have an Iron Flask in my current campaign, and we happened to find out that it contains Tiamat. We released her to have a conversation, where she threatened to eat me at the end of the hour. Since it didn’t directly lead to her death, I ordered her back in the Flask, but am not sure if that’s okay? If you order the creature in, do they still get to make the save?