I'm thinking the "mother" may have used a silencer.
I am uncomfortable with the use of "mother"...granted, Ms. McGeehan committed a heinous act taking her daughter's life, but it seems up to that point, while struggling with depression and mental issues, she was close to the child.
Who knows, really, what was happening to Ms. McGeehan? Who knows, really, what any of us are experiencing or how well or poorly we manage our struggles? There is the inevitable fact that she murdered her child, and that is unforgivable. We can "backseat drive" and say "she should've " this, or that, or the other, but we were not inside her head or within her circumstances.
None of us are born knowing how to be mothers. It is an ongoing process; my youngest is in his 30s, and I'm still learning. And, mind you, I was not very young when he was born. A mother is, ultimately, a human being who enters this relationship with a child (whether by giving birth, adopting, fostering, voluntarily, by accident...so many factors) while carrying with her the frailties, concerns, fears, strengths, experiences of her lifetime until that moment. If she had some sort of trauma, regardless of the joy she felt in her mothering experience, that's in there as well.
My opinion, and I agree its value and soundness is debatable, is based on experience. My mother was mentally ill from childhood, and it impacted all her children; some of us turned out mentally healthy, and some of us didn't. We have all, in one or another way, inadvertently, even without realizing, repeating patterns we experienced. Some of us caught it in time, and some of us remain oblivious.
I grieve this child because she was an innocent, but I also feel for a young woman who obviously, perhaps while cycling through feelings she couldn't control and had not sought help for, reached the moment when her child's life was expendable. Even her mom didn't know it was as bad as this, and she had obviously shared with her mother her concerns and her difficulties with other cheer moms.
Some people can find their way out of the darkness, some people generate their own darkness, and others can't escape it. That a child's life has been cut tragically short because of her mother's mental health issues (because that is what it was, ultimately, that caused this...along with a gun she shouldn't have had) is inexcusable.
This is just my opinion, of course. I, personally and on this Ash Wednesday, cannot erase the entire endeavor of her life with Addi. What she did was horrible. That she did it in a spirit of evil and hate for her child, I doubt...I hope it's not true.