I am sorry to hear about it.
I believe that there's a deeper reason for this. She probably does not take the faith seriously, otherwise she would not show it so explicitly through her clothes. It might be that she felt controlled and restrained while growing up, and, now that she is an adult, has rebelled against the education that she has received.
I am not sure that there's a lot that you can do for her at this point, besides prayers and sacrifices. Even if you can convince her to wear proper female clothes, she has to make a real conversion, but just externally. This is such a terrible age, the 20s.
Use the influence that you still have on her to try to understand what is wrong and try to remedy it. I mean, it is not about clothes, there's something deeper wrong there.