If you have questions about it, go talk to her, but bring a friend as a witness, so it wont just be your word against hers if she was unfair to you. Plus the support of having someone on your side will boost your self confidence.
Always take someone with you when you think their might be some friction between you and someone in authority.
If you dont have any friends that are willing to do this for you, bring a family member or even an advocate not affiliated with the school.
As far as whether she was fair or not, she sounds like a poor teacher because she is giving conflicting information and is not specific...then clobbers you when you dont get it.
If this continues...you and your witness go to the school authority and explain the situation.
You are paying money to go to school,therfore you should get what you pay for... she really sounds like a lousy teacher.
Jojo
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All art is a kind of confession, more or less oblique. All artists, if they are to survive, are forced, at last, to tell the whole story; to vomit the anguish up.
-James Baldwin