Your original post does indeed come across as very controlling.

I stand by what I've said. I've given you my perspective. I wasn't lambasting you, rather that is your spin on what I've said. (Try not to input your own tone, ok?)

You don't understand that controlling someone's major in college IS indeed controlling their entire future. "oh, honey, don't study biology even though you want to go to med school". See where I'm going with this?

I don't understand why you can't just simply say to her "Sweetie, you know I want to support you in everything that you do, but I am concerned about the amount of debt you'll be taking on". I guess if it really is indeed as simple as you're stating, why can't you say these....26 words. Shouldn't this sort of thing come naturally? I guess I just don't get it? Why are you trying to complicate things when it really is that simple? Maybe you're over thinking it all. Maybe she's a raging nut case who flies off the handle and you didn't tell us this part and you're actually asking for how to treat her with kid gloves. Really, I have no idea.