Decorate parents area

So her parents just co bought (fully bought) this house, not to use it at all beyond 1-2 visits in over a year and a half and then they let her decorate their one bedroom space? Why? Isn't this theirs? Shouldn't they come and get it ready as they want? So many inconsistencies and mistakes, I can't keep up. Her parents enabled her entitlement to a point that's truly tragic.