The young Bangor mother accused of sickening her 7-month-old baby by passing methamphetamine through her breast milk and operating a lab to manufacture the drug was admitted to the Penobscot County Adult Drug Court on Wednesday. Alyssa Murch, 21, pleaded guilty to one count each of unlawful furnishing of a scheduled drug, endangering the welfare of a child, unlawful operation of a methamphetamine lab and violation of a condition of release. In her plea agreement with the Penobscot County district attorney’s office, one count each of aggravated drug furnishing and domestic violence assault against a child were dismissed. She was sentenced to three years with all but 76 days suspended — the time she had served since her arrest in April on the charges — and two years of probation on the charges related to her child.