[As she's picked Marjara to be an easy place for Widowmaker to start forming 'friendships' within the Legion, she feels obligated to respond to this. Unfortunately, her lack of emotion and empathy made her approach this with bluntness usually reserved for Sombra and Reaper.]

Why ask for things you already know? It will hurt. It will feel foreign and separate from you until you get used to it. It will never feel real like what you lost, but you will get used to it.

You fear none of these, Marjara. And you will not lessen your sacrifice by having it replaced.

[That last bit was conjecture on her part, but what other reason could the elf need such pathetic reassurances.]