Join Date: Jul 2013
Location: Western Australia
Decide on what you will be aiming to feed her, and where you will be keeping her.
Then look at what she is currently fed and the area where she is kept.
You then need to look at a step by step transition between the two.
Try to make sure that the feed etc on the transport you are using to get her there is the same as in Spain, and keep her feed the same of a week or two after you get her to her new home. This will let her get used to everything else that's new before throwing new feed into the equation. It might mean transporting a bag or two of feed over from Spain with her too.
Then slowly, transition her to the new feed/routine.
That's the basics, the specifics will depend on you particular situation, but the original post didn't have much detail.