DO NOT do this. It is illegal. Adcoms CANNOT legally give you this information.
THE ONLY WAY is if your former guidance counselor calls or if a teacher or that former guidance counselor can look over your full file. That’s it.
The “request a rec for a scholarship” is harebrained, sorry. The GC is likely to ask for a stamped envelop and wouldn’t give you a compromising letter.
In addition, the issue isn’t likely to be a recommendation your teachers wrote, but your SSR – ie., what the GC fills out - there are several parts: how long they’ve known you and what comes to mind when they think of you, plus a few other short answers; a grid where they check if you are above average, very good, excellent, outstanding, or one of the top few in career for character, respect accorded by peers, respect accorded by faculty, initiative, creativity, collaboration, intellectual curiosity, etc - I’m paraphrasing but you get the idea; a written evaluation; a final recommendation line where they recommend you ‘enthusiastically’, ’ without reservation", or “with reservation”; a school profile; your transcripts; test scores. In short, accessing the recommendation will be of zero use since the issue is likely the parts of the SSR your GC filled out, such as the short answer, the grid, and the written evaluation.
If her evaluation consisted in " trouble maker: got a collegue fired by rousing the students", yeah, there you go, you know why you were turned down. But until your former GC or a teacher can go over the whole file, you can’t assume anything.
GET YOUR PARENTS INVOLVED. GCs aren’t allowed to “screw” students over. It may not be what happened, you may have been denied for other reasons, but you want to find out what happened.
In addition, next year, can one of your parents volunteer in the GC office?
(In addition, note that UCs don’t consider recommendations, so you may have a shot at these.)
It’s time for you to talk with your parents. What have they been saying so far about those surprising results?