I don't know
Sure there are the funds to treat her. The question still remains, are they allowing her to be treated.
ARE there? As you wisely pointed out, we do NOT know what goes on behind those palace walls. Are they funds being put aside to treat her?
I wonder ...
We don't know what goes on behind palace walls. The IHA even picks out her clothing, what makes you think they will allow her to be treated by physicians when its better to leave her as an embarassment so the road is paved for Akihito and Hisahito. Much cleaner that way. No crazy talk about allowing a woman on the throne.
Oof-dah! I don't think The IHA ACTUALLY selects her clothing! That seems to me to be a bit over-the-top, and preposterous, to me, no offence. I think Designers come to The Palace (that she and Naru inhabit), and show her their creations which they think will suit her and the demands of her "job". Then, within certain strictures and guidelines, as priour set forth by The palace, Masako-Sama makes her choices. Even in this day and age, I cannot fathom where Masako would ever permit anyone to chose what she wears! And, I can see Naru throwing a "hissy", too.
Also, I have to take issue with your thinking that The IHA might prefer to have Masako be their embarrassing "foil" (if you will) so that Naruhito's Bro and his wife can take the reigns of Royal "leadership" when the time comes. I don't think so, only because I cannot IMAGINE anyone thinking so distortedly.
For all we know, her being a smart woman put her in disfavor with the IHA in the first place.
I can ASSURE you of this: If The IHA did NOT want Naru to marry Masako, they would have put their collective foot down, and THAT would have been that!
They would not have allowed such a Union to transpire.
Remember now, that The current Emperor and Empress LOBBIED so hard, for Masako's inclusion into the family only AFTER having met with her and her family repeatedly, before the engagement was approved, let alone announced to The Media! They vetted her and her family, her background TOOTH and NAIL.
Now that they have broken her, why not leave her untreated and unpopular so Kiko's star can rise. After all, she is the heirs mother, not Masako.
However they have NOT, as you put it, "broken" Masako! They haven't. She's has some setbacks, but she is far from being "broken".
Her affliction / her condition IS treatable!
-- Abbie