I like Ice.
A) She will slow things for you, providing a little crowd control.
B) Fire is the most widely placed monster immunity in the game, in hell, 40% of all monsters are immune to fire.
C) There are several bows, 'Brand', Kuko, etc., that fire exploding arrows. Equip your Ice rogue with one of these and when she's not firing ice she'll being attacking with fire, making almost nothing immune to her. (Just a suggestion, I know you're using Faith.)
That's why I like 'em.
I have a lvl 91 Ice rogue as my bowie's partner in crime, and she rocks my socks. Have fun...