Nah, that gets into the whole "why isn't she burning herself, etc". Its a manifestation of her will: if I was manifesting a fireball hot enough to burn a god, I'd make sure to do it a couple of centimeter outside my skin as well. You can see where the light-source starts; the AE particles follow that rough area as well. In-game the player character actually manages to give himself a sunburn by carelessly triggering a fireball on his homework papers.very nice! but the fireball should start in her palm, not under it
(the image clip is from a mage battle in Book 2 of Love of Magic).