This is an unusual assumption, I am sorry to say.
First, why should we even think that there is a suicide note? SW was the mother of two kids, pregnant, and very organized. In this day and age, if she felt suicidal when pregnant, she’d definitely seek help. In what form, seeing a counselor, a pastor, or a doctor, I don’t know, but she’d do something. I doubt there will be any note.
Second, she was the person glued to her SM. I can imagine her making a video or a post on FB, too, and for sure, people would instantly respond, but we have nothing.
So, I think one should drop this idea.