Board Thread:Character Discussion/@comment-26179634-20150102043654/@comment-25355646-20150103213810

I don't think so. Ingrid was able to wield Emma and Elsa's powers because she had already excepted who she was and she believed that Emma, Elsa, and herself were a perfect match. Ingrid sacrificed all of her magic in order to cast the Spell of Shattered Sight, which is why Arendelle unfroze immediately afterward. So in 4x10, she was still using some magic because she was drawing on Emma and Elsa's powers.