[@Claw2k11]
I wish you luck distracting her.
If you plan on using fire to distract her by making her block it so he can flank her think again. Oldest trick in the book. She doesn't need to physically see her opponent to know where they are as I eluded to in an earlier fight against Aleph (it's buried somewhere).
Also if you did happen to get close enough Vesta knows her weaknesses and has made counters to them. You don't become the strongest earth mage (To be fair, that's mostly what she calls herself. It's yet to be proven. There could be a more powerful earth mage she doesn't know about XD) by ignoring your weaknesses and focusing on your strengths.

Also most people in this world will be forced to use incantations to use their magic. Vesta is one of those few who doesn't need one, though if she uses a big spell she will use one. If she starts using incantations then the fight will be getting quite serious XD