If she will only eat live chicks then feed her live chicks for a while. I wouldn't worry about them being oversized as they're not all that dense a feeder; their bones are pretty light. They do leave a big lump but it goes down quickly; baby retics have a high metabolism. If you're worried about overfeeding you can put her on a 7-10 day schedule.
Once she's at the point where a chick is a small meal for her, you can try "chaining" a warmed f/t rat pinky or fuzzy behind it so she learns to associate rats with food. Eventually she will start taking f/t rats without needing a chick as an appetizer.
I'm not worried about overfeeding her, there is just a limited amount of live chicks near me. And they want $6 a damn chick
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