Perhaps adding a "Big" rune onto the bead before enchanting will make it brighter? The notes seem to indicate "Big" runes increase the strength of spells.
She also considers replacing the "Sun" rune with a "Moon" rune on something. Perhaps it'll make her harder to spot, or even better, maybe it'll make her invisible? On the other hoof, Antione made it clear that she should be careful when doing spells she doesn't know.