Is there a reward for a girl's charity from her father's money – other than cash, such as food items that she buys – knowing that it is without his knowledge?

If a father permits his children to give charity from his wealth, it is permissible for them to do so, whether the permission is explicitly stated or established by common practice, because custom is a valid arbitrator. This includes money, goods, food, and other items, as all of these fall under the category of "wealth" if they have value according to custom. However, if the father does not grant permission, giving charity is not permissible.