Thighs

Moonbow will deal more dmg against high def targets, which is why I would choose it over Glimmer which is only very rarely better than moonbow (usually only on characters with an absurd attack stat).

Her atk isnt that high so shell always preffer moonbow over glimmer

i would go ignis if she isnt -def.

If I recall corectly, glimmer does not increase damage from wrath or Harmonic Lance, then moonbow is preferred imo.

Moonbow. She has lowish atk so sometimes she'll have those awkward "proc Glimmer for literally no additional damage" situations.
Also I agree with the thighs statement

I'm kinda ashamed I clicked this open purely due the topic name and half-guessed what it would be about! :D

Anyways, like they say stick to Moonbow. I'll probably do the same myself, with the IVs my Shigure got.