It depends on why you are calling. Her bond will be revoked, she will be put in jail. Are YOU and YOUR MOTHER ready for that to happen, or is your mother going to just start another cycle of enabling from there? I say this gently b/c I know it's very hard. However, if you or your mother plans on helping her out of this situation in any way, there is no point in calling in my opinion. However, if you and your mother see she needs consequences to have any chance at all of being well, and plan to let her suffer those consequences on her own, then pick up the phone.
This is all just my .02
Hugs.