@HannahN, You’re assuming all grades are weighted equally, which is not normally the case. Here’s an example of the one way your grades might have been computed.
In my hypothetical quizzes are weighted at 20% each, the final at 50% and lab notebook at 10%.
Under this grading method you would have earned an 81. If the prof dropped your classmate’s first quiz grade, doubling her second quiz score she would end the semester with an 86.13, clearly a better grade than yours.
In the end this is not a hill to die on. You may not agree with your professor’s grading system but it seems perfectly fair. All you can do at this point is work hard in your next class.