i tried to translate the tattoo from demon language using the key it came out as [waqanaha berry yoiakuma] with y(o-i)(i-o)a(k-e-n)(u-m)ma being uncertain but the other possible letters are listed in order of likelihood by my visual opinion
ok but what happened to all her other magics before she was killed because despite a "weak" body she should have much more magic than before and be able to defend herself like she did because she didn't only use the heroic spirits