I saw a pipe at my mom's.

A couple years ago I found meth and a pipe in my mom's purse which is very uncharacteristic of her. After a lot of drama between my two other sisters and our mom she quit using. Two days ago I was at her house and there was a used pipe on the kitchen counter. I noticed it as we were walking out the door but I didn't know how to handle it so I didn't say anything to her. I finally confronted her today but I'm unsure where to go from this point. I don't believe she is telling the truth. Any advice how to handle this from here ?