I believe Celene drew her weapons on Briala first, and I think she asked Celene about the plight of the elves so that Celene would be honest with herself. I think Briala knew at the end that the elves were never going to see the freedom Briala hoped they would get. Celene did not even have a plan; she had words she told her lover, and yes, I know she probably meant them when she said them, but I think Briala knew she really couldn't deliver.
Ugh, stop making so much sense.

Yes, I'm pretty sure you're right. I guess I just really
wanted Celene to stay true to her promises. It would have been so glorious, had it not? The empress herself announcing that elves were to be equal to humans, with Briala as their Comtess. I was really looking forward to that. xD
As for the ring, it showed the wearer openings. I don't recall anywhere where it stated or implied that it was used to make someone fall in love with someone else.
Please correct me if I'm wrong.
I didn't mean it like that. Sorry, my sleepy head didn't make much sense yesterday.
After Celene explains the ring helped her never lose her wits, Briala says that Celene's never losing them was part of what made her so attractive. Re-reading the passage I guess it could have been meant as a reassurance on Briala's part, an implication that Celene didn't need the ring. On my first read yesterday, I read it as Briala declaring to both of them how one of Celene's most attractive traits was not actually her own, but rather something she gained by wearing the ring.
I have to say, I hope Briala and Celene do NOT get back together. Celene had her parents murdered. No kissing and making up for that. Period. 
I'm not sure if Celene would give the elves more freedom. She needs her nobles to support her, and she might get too must resistance if she pushes elven rights. However, getting the elves on her side would be a huge advantage for her... so who knows? 
On a side note, I wonder if we'll see Michel. I really liked him.
*sigh* They're not getting back together, are they? And even if they were, it's not going to be the unicorns and puppies that I imagine. I just really, really liked their chemistry, okay? xD
I hope Celene at least tries to give the elves justice. I don't want to see them fight.
Michel was pretty neat as well, yes. Wouldn't mind encountering him =) I can imagine if Imshael is in DAI, so is Michel.