Knife ears are either xenos scum or mutant scom, they'd more then likely try and purge her.
well i can see some inquisitor seeing her desire for purging demons as useful and keep her as one their "domestic Psyker." or something along these lines, i mean... if inquisitors can use certain demons as weapons.. why cant they keep the knife ear midget. now if that will fly with other inquisitors/grey knights.....
Knife ears are either xenos scum or mutant scom, they'd more then likely try and purge her.
If they were IG, Ecclesiarchy or Deathwatch maybe, but not Ultramarines, especially post-Gathering Storm. They know the value of an Eldar that wants to kill Chaos.