The Brunswick County District Attorney's Office tells us the matter is "under investigation" ... noting it is "working closely with the Brunswick County Sheriff's Department."
As we previously reported, Jenelle was caught on tape beating the crap out of another woman earlier this week.
UPDATE 12:40 PM PT: Sources tell us the D.A.'s office has contacted both sides, but there is nothing they can do unless Britany comes forward and presses charges.