Without a doubt, Professor Hazel was the most prepared professor I've had during this time of distance learning. She came well-equipped to teach online with ethernet and a tablet. She was also extremely well-spoken and very clear in her lectures and explanations. The homeworks were optional, so the class was graded based on the weekly quizzes and the three exams. I enjoyed her personality and her teaching style, and I would definitely recommend her.

Prof. Hazel is very clear in lectures and gives great explanations in class about all those conceptual things. But one thing to be careful- she's super strict on proofs. For instance using symbols rather than sentence, missing the assumption statement in proof by contradiction, etc., might all lead to deducted points. HW's are just for practice (no need to submit), but there are weekly quizzes testing HW contents. There are two midterms and one final, all of them doable but like I said, very strict on wording of proofs. Just be very careful with details!!

You should definitely take 115A with Prof. Hazel. I took 115A with a different professor last time and ended up dropping. Professor Hazel's lectures are so much better!!!
She provides very clear examples about how you should write proofs and her quizzes and exams are around the same level of difficulty as the homework. She's super helpful during office hours and will go over a simple concept with you multiple times until you understand.
However, you should know 115A is still a difficult class. I barely got an A and that's because I've taken 61 and 115A before. It's important to have realistic expectations going into this class.