I sure wish someone had called the cops the night my brother was killed by one. He was only 19 years old and he was taken away from a family that loved him very much.
It devastated my mom no parent should ever have to bury their child!
Put it this way yeah she will be mad but you are possibly saving her life and others.
How would you be able to deal with knowing you could have called and then God forbid she wiped out a whole family just on their way to whatever? Or she wrapped herself around a tree. Its worth someone getting upset don't ya think?