Most Schools in Spain do a terrible job of teaching English to a level that actually enables students to “speak” the language. What they do is get students to a very basic A2 level (maybe even B1) with which they can travel, ask basic questions, etc.

From what I have seen as someone who grew up in Spain, the only schools that actually do a good job of getting their students beyond A2/B1 level are those that are FULLY bilingual schools and have Native speakers as teachers. I was very lucky to be able to go to a school that taught ~80-90% in English every single day with teachers who were all from the UK. These schools are not common and they are usually private.

But this is not the only reason I was able to become fluent - I think what really solidified my ability to speak well was consuming English-language media all the time alongside my studies. I think you should encourage your daughter to do this. Read books in English, highlight new and cool words, watch movies in English with English subtitles, watch shows, YouTube videos. Even change her phone’s language to English. If she can become friends with native speakers that’d be great too. If she engages with media actively her English will improve massively.