First
Nope ... Ragzlin death turn whole camp hostile there is no way around it ...
The only way to diminish this effect is either poison Goblins outside, wich drasticaly lower their numbers and HP.
OR
Fast travel out after you kill Ragzlin (presuming he was last leader to kill) to avoid them an never return.
Second
Invisibility + Shove ... still 100%
Besides that ...
Magic Missile to destroy her clones ... remember that Poisoner's robe is buged this patch and adds damage to EVERYTHING ...
So Magic Missile can do 1d4+1 Force + 1d4 Psychic (neckage) + 1d4 Poison (robe) + 1 OR 1d8 (staff, depends on charges) and maaaaaaaybe +1 (ring ... but i didnt try this) ...
So i strongly dont recomend using it on Marina clone.
Third
You can destroy moonstone that statue in the middle holds that disables the trap ... carefull tho, there will be minotaur attacking the gate and if you disable it too soon he will reward you by trying to kill you.

OR
While you are facing the gate, have stairs behind you, once you reach the statue simply went to the left ... one window is missing.
