What was Celeste’s plan after the Mikaelsons left New Orleans? Was she just enjoying life lol?
Also, how do you think she would have reacted at Elijah turning his back on Klaus and fomenting to actually kill him, had she knew?
Celeste's initial plan was completely derailed by Klaus having her killed. Celeste had a body prepared for her in case something happened, but it was initially a way to spend eternity with Elijah without having to give up her magic.
But then Klaus had her killed and Elijah didn't turn his back on his brother so she came up with a plan to get her revenge. We don't really know why she waited so long. The Mikaelsons were in town for about 100 years after her death. A lot of this time was very volatile. I like to think Celeste was working behind the scenes to protect her witches, however, when we see her in 2012, she seems less concerned about protecting her witches and more concerned about revenge. Another theory could be that she didn't have a way to kill Klaus for revenge but she also didn't have a way to kill him in 2012 when she summoned them back.
But I don't think she was enjoying life. From what we see, New Orleans was never a safe place for supernaturals. Rebekah kills her when she kills Genevieve. She was constantly having to hide herself. After the Mikaelsons left New Orleans, Marcel worked to take over the Quarter. It appears a war between the factions lasted until the Mikaelsons came back, which only happened because of Celeste.
I don't think Celeste ever knew of Elijah's plan to kill Klaus. This wasn't something Elijah wanted people to know so it wouldn't have spread to New Orleans. I like to think if she knew, she would have reached out to him and helped. But she also could have been angry that he didn't react that way when she was killed. Instead, it took Klaus drowning their siblings for him to turn on Klaus.
Thanks for the ask!