User blog comment:EvanDude345rv5/Fairy Tail 356: Tartarus Arc Prologue/@comment-7418318-20131020091019/@comment-7418318-20131020223127

I know that. What I tried to point out is that I doubt she was at that level at the time already.

Siegrain most likely thought that if she had survived, she would have grown into the necessary strength to become one by now, rather than already being at that level several years earlier when she fought Deliora.

And "comparable to Gildarts" is quite a leap of faith on her behalf. Sure they dressed up the scene in the anime a bit, but even there we saw too little of her powers to really judge.

Deflecting a laser with a reflective surface isn't something that reuqires a lot of power after all, just quick thinking (and moulding) and a certain precision to give it the correct angle to deflect into a spot where it doesn't cause anyone harm.