Is it permissible to open a grave to bury a daughter if her mother was previously buried in it?

It is not permissible to bury two or more persons in one grave unless there is a necessity. It is also not permissible to exhume a grave after the deceased has been buried unless it is certain that the body has decomposed and turned to dust, in which case it is permissible to exhume it to bury another person therein. If there is doubt about this, experts should be consulted. If bones are found, they should be reburied, and a grave should be dug elsewhere. Therefore, it is not permissible to open the grave to bury the daughter with her mother, because the time between the two deaths is not sufficient for the body to decompose.