Is this Child endangerment?

My sister is a meth addict,. we both live with mother, I have a 17 month old Daughter that lives with me as well and I have been telling her to stop using meth around the house or move on, she is very rude to mother and mom is scared to say anything, I found a bag of meth laying in the hallway a couple months ago, last week my girlfriend was driving me home from work a told me that my sis was home making marijuana brownies, I was so f%$@ing Mad! this has to stop and what do i have to do to get her help if I call the sheriff will they arrest her or just tell her to stop, she has been doing drugs since the age of 16 and she is 56 now, rude and hateful and told me she dont care about what happens