Leave it is also a good tool for this. It might take a while to build it up to a level where she will leave the cat on command but it is easy enough to teach.
I also think leashing her/crating her is a good idea. That way she is not reinforced by chasing the cat and doesn't keep biting at the cat, etc. I don't think the dog should be loose with the cat until she grows up a bit and learns some self control.
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