Clicker training can help with this kind of issue, there's lots of different ways you could do it but the way I would, would be to teach a watch me/look at me cue. High quality treats likes sausage or chicken can help to ensure her attention diverts to whoever is staying with her rather than whoever is leaving. If she gets these tasty treats for being still and quiet whenever somebody leaves she will associate someone leaving with a good thing rather than it being bad and stressful for her. Hope this helps x
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