"If she wants to go into nursing she absolutely needs to be fluent in English"
Apparently you have never been in a hospital in California.
I've haven't been in one as a paitent but even 20 years ago doing work on them there were very few nurses that could speak much english or any at all.
That's frightening. I hope they at least were educated by Spanish speakers? Because I don't think you could learn all of the necessary material in a US school without speaking English.