What is the ruling on eating sweets that my mother used to secretly take from her work to the house, knowing that she cannot return them due to the large size of the company and the fact that the stolen items are small pieces?

Workers must adhere to what the company has permitted and not violate what it has forbidden. Whoever takes forbidden sweets home is an aggressor, and it is not permissible to eat what he brings, because one who takes from a usurper, a thief, or an aggressor is like them. The way to absolve oneself of this is either to return it if possible, or to return its value to the company if returning it is not possible.