The lesson states: A) If it/he/she is is followed by un/une/le/la... (any form of article / determinant) - it is a beautiful dress / she is a nice person - then you will use c'est.
Now not being a native french speaker, and still very much a student, it still feels wrong to use “c’est” here, as so the lesson also states: B) il est/elle est for statements and opinions related to specific things
You can only say -
C’est une très bonne danseuse
Valentine est une très bonne danseuse
You will not have -
Elle est une...
Hope this helps!
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