In case this information is serious (it is not anything confirmed), is not only a question of Zarzuela, they do not control the embassies .... and we do not also know in that moment this protest would have been realized. But they have the right to demand to a publication, that it is serious and it does not publish things that are not true. It is not the first time for that diplomatic route asks itself that there should be corrected an information that is not true. On the other hand, this one is serious enough topic, first because they extend rumors on the health of a person (the more intimate thing that can exist), and second because nowadays the nourishing disorders are a serious problem in many societies and to be necessary to demand that someone is not in use to for being frivolous with it and to do business.
In Spain they stop the feet, more of once, but it they lasts a few months and later they return to do the same thing. One of last case has been the separation of the Infanta Elena, from Zarzuela it was required to the press to put brake on the daily harassment, specially on the harassment on the children, and this pressure has descended very much. Also the King has stopped the feet in gossips on him.
For once it is necessary to be glad that they defend the Princess, because till now she and her family have been the most unprotected. I believe that the King or his advisers have realized late of what is a certain press nowadays, and Letizia has paid it ... probably they were thinking that while the press was doing business with her, the rest of the Royal Family was free.