The noun 少女 (shàonǚ) means 'young girl' or 'maiden,' typically referring to a girl in her teens. It is composed of 少 (young) and 女 (female). It carries a slightly literary or refined tone and is commonly used in both written and spoken Chinese.
那个少女弹钢琴弹得特别好。
Nà ge shàonǚ tán gāngqín tán de tèbié hǎo.
That young girl plays the piano exceptionally well.
公园里有几个少女在拍照。
Gōngyuán lǐ yǒu jǐ gè shàonǚ zài pāizhào.
There are several young girls taking photos in the park.
她写了一本关于少女成长的小说。
Tā xiě le yì běn guānyú shàonǚ chéngzhǎng de xiǎoshuō.
She wrote a novel about a young girl's coming of age.