Letizia is reduced to being merely an assisting decoration "piece" and therefore she should be decorative at least, which she is less and less. And when that doesn't work what else is left: the loving wife and mother? Is Spain going to pay her for that alone?
If Letizia (and Felipe) had thought herself as a merely assisting decoration, she probably would have tried her best to decorate perfectly. The press had mentioned many times that Letizia wanted them to pay attention to her work, not her wardrobe. It's so funny that some of her detractors in Spain thought she was the one running the show. I guess from merely a decoration to the one running the show, the truth must lie somewhere in-between.
She had a very difficult pregnancy last year and was being held back a bit. According to the press, she will have more solo events starting this fall. On the other hand, the other crown princes don't have Felipe-like working schedule except for Charles. Nothing wrong if they continue working more as a team than the others.