"It is not permissible for a woman to give a gift from her wealth, once her husband has marital authority over her." This is the wording of (one of the narrators) Muhammad.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَجُوزُ لاِمْرَأَةٍ هِبَةٌ فِي مَالِهَا إِذَا مَلَكَ زَوْجُهَا عِصْمَتَهَا اللَّفْظُ لِمُحَمَّدٍ