What is the ruling on a wife donating gold given to her by her husband without his knowledge, and is it permissible for her to conceal this from her husband to avoid showing off, and is it permissible for her to claim it was lost if asked about it?

A woman has the right to dispose of her possessions, and her husband has no right to interfere in her financial transactions as long as they are within the bounds of Islamic law. A gift is considered the woman's property, and she may dispose of it as she wishes. However, it is not permissible to lie by telling him it was lost. When the husband asks, she can tell him the truth or use allusions and circumlocutions to conceal the charity.