just sending a message out there to all you gamers to see if anyone knows where i could find the rules for the mutant girl Lathesia
i saw her rules printed in one of the magazines in a games workshop store years back and forgotten which one, by chance does anyone know?
I wasn't aware that there were ever any rules published for her - however, if you try over at the Conclave I'm sure someone will be able to help you write some rules (this place has been pretty dead recently).
Her rules weren't published in any of the magazines, but she did get a profile on page 16 of the Inquisitor Conspiracies book "Death of an Angel". Of course, like most of the Inquisitor publications, this is now OOP. Which means it's unlikely to be found anywhere but eBay, but especially not by using the links in my signature.
However, her profile was meant to be used by the GM, not players, and is thus... quite powerful, particularly given she came from an earlier age of Inquisitor where characters suffered from hyper-competence.
To be honest, I would recommend re-writing her - or rather better, writing your own original character.