"who's a good girl" meaning in English

{
  "forms": [
    {
      "form": "who's a good girl !",
      "tags": [
        "canonical"
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    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "who's a good girl!"
      },
      "expansion": "who's a good girl!",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "name": "English rhetorical questions",
          "parents": [
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            "Idioms",
            "Questions",
            "Sentences",
            "Figures of speech",
            "Multiword terms",
            "Rhetoric",
            "Lemmas",
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      "examples": [
        {
          "text": "Fetch! Fetch! — (dog fetches stick) — Who's a good girl!",
          "type": "example"
        }
      ],
      "glosses": [
        "A conventional phrase used to praise an obedient female dog (bitch) or other female domesticated animal."
      ],
      "id": "en-who's_a_good_girl-en-intj-OLrkIPbz",
      "links": [
        [
          "conventional",
          "conventional#English"
        ],
        [
          "phrase",
          "phrase#English"
        ]
      ],
      "related": [
        {
          "word": "good girl"
        },
        {
          "word": "who's a good boy"
        }
      ]
    }
  ],
  "word": "who's a good girl"
}

{
  "forms": [
    {
      "form": "who's a good girl !",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "who's a good girl!"
      },
      "expansion": "who's a good girl!",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "related": [
    {
      "word": "good girl"
    },
    {
      "word": "who's a good boy"
    }
  ],
  "senses": [
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      ],
      "examples": [
        {
          "text": "Fetch! Fetch! — (dog fetches stick) — Who's a good girl!",
          "type": "example"
        }
      ],
      "glosses": [
        "A conventional phrase used to praise an obedient female dog (bitch) or other female domesticated animal."
      ],
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  "word": "who's a good girl"
}