Im going to be left alone for college by my best friend

I (17F) recently moved to another island for college. My best friend (18F) happened to also be moving too. We ended up finding an all girls housing to live at together and we basically decided to look out for each other and kinda support each other during college. We moved around august 15-17 and everything was moving smoothly till this week.

She randomly started freaking out about classes being stressful and decided that she was going to drop out and take a gap year even though she needs to complete her degree path in a certain time frame and she is planning on switching her major. She also has done a year of college so she has some classes she needs but i feel like if you were already academically stressed out from barely two weeks of school imagine how its going to be when you have to rush to finish a degree program in 2 years.

I havent fully told her how i felt about it all but guys im kinda pissed off and hurt. I didnt expect something like this to happen and i feel like im losing a support system. I genuinely feel alone on this island and now i have to do things by myself. Ive honestly been sobbing tears about it and she keeps telling me that i am “emotional” but how would you feel if you were 17 and having a friend leave you.

Should i tell her how im really feeling? I dont want my feelings dictate what she wants to do but i genuinely think her decision is stupid on the whole, putting my feelings aside.