Judge Sanchez was a Justice Department member in training when she assisted Judge Dredd and the rest of the department in the extermination of the Xenomorph infestation, also surviving getting infected with an embryo herself, due to department surgical intervention.  

In the aftermath of the surgery, Sanchez was initially uncertain that she had what it took to be on the streets as a proper Judge, but Dredd assured her that how she'd handled herself more than proved that she did.  

Sanchez indeed, officially became a Judge after the ordeal. 

Later on, Judge Sanchez was one of the Judges that Dredd requested accompany him on his mission to investigate the Fargo sample sent to the Justice Hall. She did so successfully and was one of those who made it back to the Megacity, along with the retrieved Eustace Fargo. 
Community content is available under CC-BY-SA unless otherwise noted.