Taking Latin in 9th grade because she’s heard it will be useful in medical school is crazy talk. Right now she’s interested in the medical field, but it is a long time from now until med/pharm school - and who knows if she will end up at either of those!
She can stick with the plan to take more Spanish for now. If she still is probably pre-med by her senior year, then if she wants to take Latin that would be soon enough to do it for pre-med purposes.