It is not a custody issue as by law dogs are regarded as property (harsh as it may sound).
If it was her dog, and she just gave it to the brother's girlfriend to look after, it is still her property.
She can sue, for the return of the dog or payment of the value of the dog (although this is obviously not what she is after), but in the same way as had she left a car or other inanimate object with her to look after, not as a custody issue.
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