Does she look dehydrated? It might not hurt to soak her for a little while in tepid water about 1" deep or so if you suspect dehydration.
You can get a substance called benibac (don't know spelling). That has beneficial bacterial to help re-establish good gut flora. Using unflavored pedialyte in the water can also help rehydrate and replace electrolytes. I cannot remember the product name, but there is also a dietary supplement you can use (you can inject into feeders) to give them more calories as well.
For size, I'd go with slightly smaller than her girth...if not very small. If she has been without food, you will want to slowly get her eating again and not shock her system by offering meals that are too large. You can try PK/ FT, but if she refuses, offering a live rat pup might not hurt as the motion might get her eating better.
Good luck and thank you for trying to save her.
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