[@Lucius Cypher]
The ice is actually formed by freezing water particles in the air or something if memory serves. Could be completely wrong though XD
I mean good old Emilia does the same. (Well the ice spears at least)
Also the words 'rock' and 'earth' don't have to be used. Main reason Vesta uses very little incantations is that I reserved those for the more taxing spells, since if one is powerful enough the lesser spells don't require any. E.g. that rock armor sounds like it needs an incantation, while launching a boulder...not so much XD