By Nancy Dillon From New York Daily News Britney Spears’ harsh rebuke of her conservatorship last month unleashed a wave of “alarming” threats against her court-appointed guardian Jodi Montgomery, a lawyer for Montgomery said Wednesday. In a new court filing, the lawyer said Montgomery now requires around-the-clock security that she can’t continue unless the judge overseeing the pop star’s conservatorship agrees Spears’ estate should foot the bill. “Many of the messages threaten violence and even death against (Montgomery),” the Wednesday filing obtained by the Daily News states. “(Montgomery) is still receiving violence and death threats at an alarming rate. These threats should all be taken seriously and carefully addressed. The safety of all parties involved is of the utmost importance. It is also in Ms. Spears’ best interest that those around her are kept safe and not exposed to a constant threat of harm,” it argues. The filing includes a …