Has your mom been controlling the details of your life for a long time, or is this a new thing that might be related to her realizing she is losing you as you move away? It might help to understand what the underlying issue is behind her outburst.
It sounds like you HAVE to have a foreign language eventually, but maybe it is better for your relationship with your mom if you pick another elective for this first semester. If she is just freaking out because the reality of you leaving is so close, then a little time might allow her to relax on this crazy point about language.
Are you set on French, or is there any other language offered at your school that might be a better choice in your mother’s eyes? I know that is not how you should choose a language, but in the big picture could you sacrifice and pick a language that might have some usefulness (in her eyes) ?
I suggest you find ways to communicate with your mom regularly without playing into her obsessions. If she has been very controlling over your entire life, she may want you to text after every class, she might interrupt your class by phoning you and then assuming you are dead because you didn’t answer your phone, etc. Be proactive in this area, think through ways you can communicate at times that work better for a college student, and be sure to communicate enough so she knows nothing bad happened to you.
Some students try to be SO obedient to their parents when they go off to college that it inhibits them from forming friendships, joining clubs, etc. I have read stories here on cc of children whose parents want them in their room for the night by 9 pm every night so the parents know they are safe. Figure out how often your mom needs to hear from you (before she would start calling the college to have them check on you!!) But if her needs are still oppressive, just don’t answer the phone all the time. A quick text “I am walking into class now” or “in a study group now” might appease her need to track you down.
I admit that I wanted to know my D’s exact schedule her first semester. I eased off second semester, and now I have no clue about her classes. She will mention things,
Set a weekly time to skype or other techy way to let her see your face. We like Sunday afternoons to “see” our college kid. And send her a handwritten note your first week of classes thanking her for raising you well. If she has driven you crazy, it might be hard to think of things to say, but find something specific that you can tell her you appreciate. Getting that note from you could be a significant way to ease her fears.