A search for 乙女 on jisho.org shows the word 少女 as a result, and doesn't give a distinction between the two terms, just listing that the word 少女 has "many forms":
- 少女 【しょうじょ】
- 少女 【おとめ】
- 小女 【しょうじょ】
- 乙女 【おとめ】
Are the four forms fully interchangeable, or are there nuances in the meaning?