All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Your wife - may Allah guide her - is in great danger, for she is persisting in a major sin; Tabarruj (which is openly displaying her beauty in an immodest way). This is a grave matter in Islam, and severe warnings have been issued in the Shariah against it.
If she truly loves Allah and seeks His pleasure, she must hasten to sincere repentance. Similarly, you should remind her that by doing so (Tabarruj), she is angering Allah the Exalted.
Lastly, if she insists on continuing, then you should discipline her by distancing yourself from her until she repents and rectifies her behaviour. However, if she persists in this shameful act, then separation from her is better than remaining with her.
Allah knows best.