Savalenoa was endorsed by Cabinet on Wednesday.
The Prime Minister, Tuila'epa Sa'ilele Malielegaoi, made the announcement during his weekly television programme.
Savelenoa is a former public servant and worked for the Ministry of Justice and Courts Administration before establishing her own private law firm.
She is also a former President of the Samoa Law Society and succeeds Lemalu Herman Retzlaff who surprisingly resigned in March after four years in the position.
Lemalu was working in New Zealand to broaden his legal knowledge and experience.