Specific Commas in an Essay Question

So, my 10th grade teacher made four corrections to my essay relating to commas. I rarely make comma mistake and really (REALLY) think she is wrong. I want to know what I should do if she is wrong without making myself sound like a smart alec:
Should I tell her she's wrong in a comforting way
Ask about the commas
Something else

Please tell me if I'm wrong on these corrections (I'm not). The word in parentheses will be (COMMA) where she put the correction and -1 points.

"Another theory important to Freud in the development of psychoanalysis was the theory of infantile sexuality(COMMA) which gave explanations as to why some feelings were left repressed in the unconscious state of mind."

"In the development of psychoanalysis, Freud was quick to figure out the idea(COMMA) but slow to get other scientists to accept it."

"Freud quickly submitted to the community his idea of psychoanalysis(COMMA) which he thought would be revolutionary in the coming years."

"Freud's problem with getting others to accept his ideas was that he had an abundance of stories(COMMA) yet no way to prove these ideas or stories."

I think I might be wrong on the 3rd one since it does join two independent clauses together, but it's not stated online as a conjunction. Thanks in advance for the support!