That's true, though it would likely depend on what level you yourself classified the characters as.

Should I simply remove the "level 6" portion of the description? If so, what should I replace it with? I could state an amount in joules that would become dangerous for her, but then I have the problem of trying to calculate the exact magnitude in joules of every attack that hits her, and I'm afraid I'm not THAT well-educated on the subjects involved. Using "level 6 attacks" as a basis gives a bit of leniency so it doesn't take all the fun out of writing the character every time she gets hit and I have to pull out a calculator, while also establishing that if a level 7 character hit her with everything they've got, it would pretty well finish her (at least for a while), while level 8, 9, and 10 characters would be progressively more likely to make her ash if she tried absorbing an all-out attack.