How do you say she is the best in french?

There are several ways to say "She is the best" in French, depending on the context and nuance you want to convey:

Formal:

* Elle est la meilleure. (This is the most literal translation and is very formal)

* Elle est la plus douée. (This means "She is the most gifted" and is also quite formal)

Informal:

* C'est la meilleure ! (This is a more colloquial and enthusiastic way to say it)

* Elle est top ! (This is a very informal and modern way to say it)

* Elle déchire ! (This is very informal and means "She rocks!")

More specific:

* Elle est la meilleure dans son domaine. (She is the best in her field)

* Elle est la meilleure chanteuse. (She is the best singer)

You can also use adjectives to describe what makes her the best, like:

* Elle est la plus intelligente. (She is the most intelligent)

* Elle est la plus belle. (She is the most beautiful)

It's important to choose the phrase that best fits the situation and your intended meaning.