A’ishah reported The Messenger of Allah ﷺ as saying When a woman gives (some of the property) from her husband’s house, not wasting it, she will have her reward for what she has spent, and her husband will have his for what he earned. The said applies to a trustee. In no respect does the one diminish the reward of the other. (Using translation from Abū Dāʾūd 1685)
"إذَا أَنفقت المرأةُ من بيتِ زوجها غيرَ مُفسدةٍ كان لها أجرُها بِما أنفقتْ -ولزوجِها أجرُه بما كَسَب- وللخازن مثل ذلك- لا ينقصُ بعضُهم من أجرِ بعضٍ شيئًا" .