Isa,
I had an idea. I reccomend you try to set up some playdates with girls from the school who are in the older class. Then you can see if she will "play up" with the older girls, and maybe she will feel inspired to learn her Dutch letters so she can be like those girls.
As for home efforts, follow up on the vision issues is important. Does she know the "Alfabet Song?" I'm wondering if some "Sesame Street" videos in Spanish to learn the letters are availible. I like the idea of teaching her to read in Spanish at home, yourself or a tutor. Sounds like your baby is a handful. Of course at this age I think most are. I remember that when things got very quiet, and I could only hear heavy breathing from the next room, that was a sure sign of trouble - what I remember most is seeing every one of my shoes piled up on the closet floor. Not very sinister, but the sound of consentration was remarkable!
Smiles,
Trinity
