Make a metal trap out of double doorways and a metal behemoth. Put 9 bear traps inside and 3plant x's just outside the back of the trap. lure her in with a tapejara. (They agro her to no end) be aware she can still almost escape this. Our level 140 took 80 tranq darts to the face from our journeyman long neck riffles. And the prime meat from 2 long necks. Be cautioned it spawned another giga in the same area immediately after we tamed her. We named her shiela.