i would not bother. cheap but exceptionally soft. She won't tie up anything. With T3 a unit of guard can beat her in a fight.
The two psycannons you can get are much better.
If you want to get a second HQ, and already have a GKT, get a cheap Inq lord with retinue (~85 for basics (lord, melta bombs, PW, 2 x acolytes and a familiar) and hide them. scoring unit for a quarter or contesting stuff.
If you are playing DH Inq lord already, ally a WH lord.