I'm super worried about having admission rescinded

So last time I checked I have a 4.3 weighted gpa and roughly a 3.8 unweighted. I have had a solid senior year except for one class. Last semester I got 4 A’s and 1 B+ in 3 AP classes, 1 honors, and one elective. However in my 6th class, Calc BC, I got a C (first ever). This semester has started out horribly, it seems like in that class I just dont quite get anything and her tests are really hard and often not weighted or curved at all. I have been doing all of the work, seeing her before every test, and studying like hell but I still have an F in her class. As of right now I have decided to see her out of class a minimum of 3 times a unit and study even more but even with that it looks like I will likely end up with a D, I will fight for a C but its a long shot and she refuses to give me any chance for extra credit or a way to make up for my bad test (I forgot 1 thing from the Unit and ended up with a %34 because it was only 6 questions but worth almost %10 of our grade). So I was wondering, if I have been accepted to CU boulder, do you think they would rescind my admission over a D in Calc BC? I am super stressed out right now because I feel like all of the hard work I have put in through highschool is going to end up being wasted because of this one class.

Get a tutor and work hard with the tutor.

I will do everything I can, it’s just that there is a very good chance that if I get a lot better I could stil get a D because of my start, thats why I was wondering if it would get my acceptance rescinded.