IMHO, she didn't "snap" and it was not an accident. It was not a "heat of passion" or temporary insanity situation. One does not plot and plan for those crimes. Here, there was internet research, acts of obtaining unusual chemicals, determining that the duty to care for Klee 24/7/365, Klee's crying and Klee's developing ability to talk (and tattle) was a problem. The financial duty to support Klee was a huge problem. These are acts of premeditation to do acts to Klee that were reckless and grossly negligent. If those acts resulted in death, it meets the definition of premeditated murder.