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in which I can use the structure "she don't" instead of "she doesn't"? This doubt came to me because of a song, and I ask myself if it's right
thanks
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Well, the word "doesn't" agrees in singular number with the word "She":

I don't
you don't
s/he doesn't
it doesn't
we don't
they don't

so "She doesn't" is the Standard form. As for "She don't", well, it's not the Standard, but that's not to say speakers don't or wouldn't use it.
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As the "voice of the people", a song may be using language that is non-standard. The song most likely uses the language of those people that the song writers are trying to appeal to. These people are not necessarily doctors, lawyers, and university professors.

I don't recommend learning English on the basis of song lyrics.

Emotion: smile