1.Sometimes trying to be on the moral high ground gets you eaten , especially when dealing with bears. And with the mirrors, yes the elves can live in a vacuum. The issue for year is that any human conflict elves get dragged in and left to rot. With the mirrors that stops. Saying that the Briala should help the human end their war over helping the elves ignores the fact the that will just end put having the humans dumping over the elves again like they always do.
Great, then they should all go live in the mirror world instead of weakening Orlais. What's stopping them? Briala doesn't seem to intend that. She appears to want to achieve something in Thedas, not run to the vacuum. If the elves ran off to their vacuum and left Orlais alone, I wouldn't have any complaints, but I see no reason to assume that is the case.
2.Because of her general goal she stated. Let say both sides make a truce and stop fighting. How can she extent the war from that? Why would she extend the war from that? Think for a moment of what she want and can do while the human are fighting their war? Would that be the best time to make a stable elven state when no human can stop them? Why help the human end their war when she can help her kind protect themselves?
She intends to free the elves. She believes the best time to do that is while the humans are embroiled in civil war, which is why she is hamstringing the winning side to prolong it, and she EXPLICITLY SAYS AS MUCH!
She not doing any wrong doing. She helping her kind. The elves are like a batted woman in an abusive marriage who get dragged back home when ever she tries to run away. If the husband is away that gives the woman all the time to get to a better place where he can't touch her or she can defend herself better. You keep say the moral thing is for Braila to help the people effect by this war by helping end it but that would just put the power back to the human nobles and the elf will be dumped on all over again. And this happen over and over again in thedus history. And you're saying the elf should risk that to help the human end their war?
I'm of the opinion that people are people, human or elf. And in my book you can't throw one under the bus for the other and claim to be free of moral wrongdoing. I am in fact not saying Briala has to do anything. I'm saying what she IS doing is wrong. Stop making claims about what I think Briala should do. I have never made such claims.