The contents of your post do not give rise to any civil rights issues. Thus, I'm going to edit the practice area of your post to "Lawsuits / Disputes" so that it reaches attorneys who practice in that area.
Ms. Berjis is licensed to practice law in the State of California. The laws of your jurisdiction may differ and thus this answer is for informational and educational purposes only and is not to be considered as legal advice. Since all facts are not addressed in the question, this answer could change depending on other significant and important facts. This answer in no way constitutes an attorney-client relationship.
You may have claims. First, you need to determine how much you are out because she reactivated the phone. Your damages, would be the charges for her phone for those months.
Next, you have to show that you took steps to mitigate your damages. Did you call the cell phone company and report this fraud. Many companies require a pin or password to make changes or get info about the account. Did you ask them to change the code or at least alert them that changes were being made without your authorization? If you haven't done this yet, do it immediately. At the very least you can prevent further improper changes.
Finally you have to consider the amount you could sue for and if it is worth your time. Say she did this 3 times for monthly charges of $60.0 each, suing for 180.00 might not be worth the time and effort to do so...not to mention based on collection laws, you may never actually collect.