Answer:
Your answer would be "herself".
Step-by-step explanation:
An intensive pronoun is identical to a reflexive pronoun but its function is different. Intensive pronouns are used to add emphasis to the subject or antecedent of a sentence. It is generally placed after after the noun or pronoun it is modifying. The list of intensive/reflesive pronouns includes the following ones: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves.
You can tell the difference between an intensive pronoun and a reflexive one easily: intensive pronouns are not essential to a sentence, whereas reflexive pronouns are. Therefore, if you removed the intensive pronoun from the sentence, the meaning would be left unchanged (a).
a) She baked the cake for my birthday