In a divorce granted by a secular court the wife was awarded half the assets of her husband in terms of their community of property marriage.

Answer

The community of property arrangement is not valid in terms of the Shariah. The wife has no Islamic right of claiming half the assets of her husband on the basis of the haraam community of property device. Therefore, she has to compulsorily return the half to her husband. The Shar'i law has to be explained to her. If she rejects it, she loses her Imaan and becomes a kaafirah.