Is it permissible for a wife to fulfill a vow she made before marriage from her husband's money after marriage, and does the ruling change if she has a small amount of her own money?

It is not permissible for a wife to take her husband's money without his knowledge and consent, except in the case of his failure to provide the obligatory maintenance. Therefore, it is not permissible for a wife to fulfill her vow from her husband's money without his permission; rather, the fulfillment must be from her own money, if available.