女孩儿

女孩儿 uses the northern 儿 ending, so the 儿 blends into 孩. The whole word sounds like nǚháir, not nǚ hái ér. Compare 女儿: there the 儿 is a full separate syllable, nǚ'ér. Beginners who say nǚ hái ér sound stiff and over-pronounced.

女孩儿 is common in northern speech and sounds casual. 女孩子 is more neutral across China and Taiwan. 女孩子 can also sound softer or refer to a young woman. In writing, plain 女孩 is a clean choice without the 儿 sound.

那个女孩儿 is the topic, and 她是谁？ is the comment about it. The pronoun 她 points back to the topic, so it is not redundant. You can also drop 她 and say 那个女孩儿是谁？ Both are correct, but the version with 她 sounds more conversational. “那个女孩儿，她是谁？” (That girl — who is she?) ── [《我的家人（2）》](/read/my-family-members#s7)

女孩儿 literally means girl, but everyday speech stretches it to young women. A 20-something woman can be called 女孩儿 without offense. For a woman in her 40s or older, use 女士 or 姐/大姐 instead. Tone and context matter more than age alone.