Board Thread:Off Topic/@comment-24534644-20170213012304/@comment-25396609-20170330014529

Come to think of it, she was able to launch shards without needing the bow at all.

it's entirely possible she just uses the glass bow because that's a form she's accustomed to using, even though she has demonstrated several times she doesn't really need it; no string because the bow is just for show, basically.