Learn Spanish (Latin America): La pobre bailarina olvida la coreografía. - The poor dancer forgets the choreography.

When pobre comes before the noun, it means unfortunate or pitiable (as in, we feel bad for her because she forgot the steps). If it were placed after the noun (la bailarina pobre), it would mean she is financially poor.

Could I say se olvida de la coreografía instead of olvida la coreografía?

Yes, both are perfectly correct! You can use the simple verb olvidar followed directly by what is forgotten (olvida la coreografía), or you can use the reflexive form olvidarse de (se olvida de la coreografía). They mean exactly the same thing in everyday Spanish.

Is bailarina used for male dancers too?

No, bailarina is strictly for female dancers. A male dancer is a bailarín. If you were talking about an unfortunate male dancer, the sentence would be El pobre bailarín olvida la coreografía.

Why does coreografía have an accent mark on the i?