Omitted se and le

Omitted se and le
 

ella (se) r?e todo el tiempo. This sentence is a case for reflexive but I have a similar problem with the indirect object pronoun as well that the "se" in this case or the "le" seem to be optional.
I meant, it's ok to omitted them as they don't seem to change the meaning of the sentence?

The reflexive verb re?rse must always be accompanied by the reflexive pronoun. The verb re?rse doesn't mean the same thing as re?r.

On the other hand, an indirect object pronoun doesn't need to appear in a sentence, as long as the indirect object is provided, or when it has recently been established.