The maximum for that charge, PC 484g as a misdemeanor, is 180 days in County Jail. It is hard to predict what the outcome in your case will be without more details. Prosecutors typically look at the sophistication of the alleged offense, here may not be all on your side, and the defendant's criminal history, which sounds pretty good. These theft charges are priorable, meaning the more convictions you get, the harsher the penalty, and a fourth theft can be charged as a felony. Consult with an attorney to minimize the impact of this case on your future.
The maximum is 180 days in jail. However, it appears the amount of the loss has been repaid. Similar matters have been dismissed, it's difficult but not impossible to have this matter dismissed. I suggest contacting an experienced attorney to review the facts and develop a strategy. Many reputable attorneys offer a free consultation. I wish you the best.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.