Sayyidah Aishah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) said: "When a woman spends from her husband's house without causing harm, she will have the reward for spending, her husband will receive the reward for earning, and the treasurer likewise, and this will be without any of them reducing the reward of another."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7849