Bizarrely at the time Isabella was Queen Portugal was one of the few European countries that Spain didn't have a claim to. Spain and Portugal were briefly ruled by the same royal family but as two distinct countries, so I went with the idea that she doesn't think she owns it.
Yeah, I know about the Iberian Union, after all I'm portuguese. I believe Isabella would have a claim to Portugal, her mother was Portuguese after all. Anyway, two of her daughters (Maria and Isabel) both married to Manuel I of Portugal.
I have to admit the decision not to include it was a little arbitary, but to be fair some of the things she's claiming the rights to are *very* flimsy (The Austrian Empire for one iirc. There's only a vague claim to that throne).