The shackles probably weighed as much as she did. But Ame forced herself to crawl over to Celaena. Aery was there, sobbing, clinging. "Aery, no. Aery, go away. Run, Aery." But of course she couldn't hear that. Ame cursed, shoved Aery away with all her might. The girl went, rolling over and curling in on herself, muttering nonsense. Then Ame panicked, because the death curse was irreversible.
Unless... She'd reversed supposedly irreversible soul-switches by using purely physical magic, not relying on incantations. She plunged into Celaena's mind to see the darkness eating at it. And with all her physical strength she threw herself against it, hopefully stopping the flow of the magic and even reversing it, hopefully breaking the spell.