I'd get a dog trainer, and not just any dog trainer, find someone who knows what they're doing. Ask a cop that has police dog or someone associated.
I'd keep the dogs separated in the meantime 'cause you just know she won't let go of him when he's back. And if she does pick on him you have to put your foot down and punish her appropriately otherwise, just like kids, she'll think she can get away with it
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