How do you say "You are the sweetest lady I know" in Mandarin?

The Mandarin teacher at my school is so nice, so I am making her a valentine. I think she would really appreciate it if it was in Mandarin. I don’t know how to speak or write it at all, so please help me out.
Is this okay to write on a valentine? I don’t have her for class, she is just the teacher at our school and has been really nice

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