There isn't always a suicide note as most are carried out on speck/spur of the moment.
Which makes difficult sorting out which mothers kill out of love.
I have no doubt that Sheila loved her boys. I wonder why that might be? When I think about it, it's only because I've been told/read that she loved them. The reality, though, is that those who have never experienced maternal love being demonstrated, often don't know how to give it. Sheila had experienced such lack, not once, but twice. I can't help but wonder if she may have craved babies of her own, but not had a clue how to deal with them when they arrived?