I remember seeing it. Your sister can stain the cabinet but during the blonde process they sealed the wood with a sealer toe seal the grain. This has to be removed before is will take a stain. Either by sanding if solid wood or stripping it. Does the cabinet have a whitish look after the sanding if it does it will have to be stipped. The blonde Danish look is more of a pickling thing meaning stained with white paint or stain and it will be deep in the grain of the wood. I would just strip lit and start over, and then she can do anything she wants with it.
We will get into the drawers and cabinets on out next trip.
Skip