Your relative seems to have violated California Penal Code section 484. The amount taken is within the range of a felony. The District Attorney of the county in which she committed the crime is responsible for evaluating whether the crime occurred and deciding whether it should be prosecuted. Usually the DA wants you to report the theft to the police in that area and they will forward the report to the DA. You can do this by telephone. The Internet will enable you to find the correct police department based upon your relative's address.
Dealing with the authorities on this will require some expertise that pertains to the precise charges. An attorney well versed in these matters could be of great assistance to you.
I agree with Mr. Brown that the rules vary from place to place.
You should get a lawyer, and even then the lawyer can only suggest a range of possible time frames that you are looking at for a resolution. There are too many variables that need to be discussed to give you the answer that you are looking for. The best thing is to actually sit down with an attorney and discuss all the important specifics.
NOTE: This answer is made available by the lawyer for educational purposes only. By using or participating in this site you understand that there is no attorney-client privilege between you and the attorney responding. This site should not be used as a substitute for competent legal advice from a licensed professional attorney in your locale with whom you enjoy an attorney-client relationship. The law changes frequently and varies from jurisdiction to jurisdiction. The information and materials provided are general in nature, and may not apply to a specific factual or legal circumstance described in the question.