Hi OP, Ok I presumed she was in year 11! I was going to offer you lots of exam tips, but I think year 9 is a bit early for that.
Is she doing it as a 3-year KS4? If so they should have lots of time to revise in year 11. That's when exam technique and past papers will come in to play.
Is there a specific reason you want her to gain a 9? It's a tough grade to get in MFL IMO - 7 or 8 is excellent. What board is it btw? Usually AQA but may not be. She will miss the new spec which starts teaching in Sept next year.
So what I would advise is still what I said - vocab and verbs.
Vocab - does she have a vocab list or booklet that she is working from? Does she have regular vocab tests? You can help her with these - support with however she learns best, whether that's testing her verbally, having post-its around the house, recording vocab so she can play it on her phone...
If you need a list there is one on the AQA website here vocab list
Verbs - these are key. She should have done all the tenses by now - so how secure are they? In Spanish there is present, present continuous, perfect, preterite, future, immediate future and more. she will need to know these for regular verbs (hablar etc) and also for irregular ones like ir and ser. So can she say I am going or He went or We will be or She speaks? Again, any way you can support with learning and testing - make a song, recite them in the car - will be great.
Tbh a Spanish holiday and Spanish films would not do much in y11. In yr 9 a holiday might be good to boost her confidence in speaking (as long as it is somewhere where she will be able to speak Spanish), but she won;t really learn what she needs from that or from watching Spanish films. Can't do any harm tho!
I would also speak to her teacher about what they expect from her and what they think she can achieve. Buena suerte and HTH