You should first consult with a criminal lawyer about your sister using your name upon being arrested and that there is presently a bench warrant out for your arrest. The  criminal defense lawyer needs to make the appropriate motion or court appearance for you to clear the arrest warrant as well as clear up the arrest in your name as opposed to your sister's name.You do not want to turn yourself in for something you did not do and then get booked, finger printed, photographed and placed in a holding cell. You would then have to get bail to be released or come up with your own money for release. Afterwards, you would then have to incur attorneys fees to correct your "arrest" for your sister using your name upon arrest instead of hers.