Does a woman receive a reward if she gives in charity from money her husband gave her, and she does not work?

Your donation of the amount is one of the best acts of worship, through which you will receive the full reward, if your intention is purely for Allah, because the money became your property after your husband gifted it to you. You are entitled to dispose of it in any lawful way you deem fit. So, you will have the reward for your charity, and your husband will have the reward for gifting the money to you.