I could imagine part of it esp for new paramedics is after learning all the new skills, to sit there and do plain old BLS feels like they are doing nothing for the pt. So they wind up looking like Liberace at the organ running through every drug and procedure they can think of.
Also sometimes, they are running scared. You older hands know that sometimes nothing is the best thing to do. But to a new guy he feels like he's somehow failing if he ain't throwing everything he got at the pt.
Or in the worst case, he's just showing off.
Without the aggressive instruction, most students will never question the WHY of any subject in any field.
I've seen pilot classes where if the instructor said the proper answer is "c. Fly directly into the cliff." everybody would nod, jot it down, and not even blink. I think it is because the modern educational system is pretty much "Sit down, shut up, here's the answer, don't think."
Well, she did apologize and explain. So there is room for hope. Maybe you can "train" her to have more confidence in EMS and win a friend instead of an enemy.
I've been involved in other professions that were extremely "turf-conscious." I always try to lead off on a friendly basis. Competent and firm, but friendly. Even when I couldn't change an organizational mindset, at least I always had a few friends 8) in the "enemy's" camp.
Besides, I can always piss everybody off later.