Are these sentences correct
She is very prim
She is flippant
She is gracious
She is flustered
SHe is conniving

If not ,how do you fix ? I just want to learn how to use the adjectives in a sentence

These are all technically correct.  Some of these adjectives would make more sense within a more defined context, such as:
She's a prim person.
She was flippant in answering him.  Her answer was flippant.