You spot her, she's kinda hard to miss.

You make her long before she makes you, not surprising considering that she is wearing power armor and toting a bolt pistol and chain sword. That sneer of cold command, the hauteur of someone who knows to the depths of her soul that she is pure as the driven snow, the casual disdain of someone 'raised to a higher standard': in short Adeptus Sororitatus. You have spotted her first, you could slink away and either try to request a new assignment or just vanish into the under hive, ply your trade as murderer for hire down there, because you know working with this 'Holier-Than-Thou' bitch is going to be pure hell, or you could accept this as part of your due penance for the murders you have already committed and wait for her to make contact, the choice is yours...