need some answers

can an administrator of an estate that had no will sell things for less money then what they are worth when there r 2 other children involved and want to know why she can do this with out there agreeing to it?

She can dispose of the property in the estate a she sees fit and she will be required to give an accounting to the court for what she has done. There isn't a law that requires her to get top dollar for everything she is selling---that is rather subjective and dependant on whomever is there to purchase the items at any given time. She is free to even donate the things in the house.