I know that nail polish must be removed before making wudu/ghusl.
But my question is, if one already has wudu, or makes wudu then wears polish (and did not break the wudu), can she pray with the nail polish on?
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
If one has Wudhu and thereafter applies the nail polish and performs Salah, the Salah will be valid. Wudhu with the nail polish is invalid. Furthermore, the nail polish should not have any impure ingredients in it. 
And Allah Ta’āla Knows Best
Checked and Approved by,
Mufti Ebrahim Desai.
“And normally the alcohol used in medicines, perfumes, etc is not extracted from grapes and dates, rather it is derived from seeds, honey, chemicals, petrol, etc.” (Takmila Fath al-Mulhim Sharh Sahih Muslim, 3/608