'A'isha reported Allah's Messenger (ﷺ) as saying
When a woman spends (something as Sadaqa) out of the household of her husband without causing any damage , there is a reward for her and for him too like it for whatever he earned , and for her (for the wife) because of her spending (for the sake of Allah) , and for the trustee also (there is a reward like it) , without any reduction from their rewards.