For her to have moved and moved and moved and possibly been drunk or slept with someone, are details that are glossed over in order to focus on the self mutilation.
I consider the explanatio that " outsiders " to this phenomenon are horrified by the act and that Leatham really seems to have ad a real go at herself ( needing stitches, etc.).
It 's obvious that this aspect had to be the focus in order for the ublisher to be encouraged to accept the manuscript.
Much, Leatham might 've chosen it as he " be all and end all " of her stay in mental institutions and seeing psychiatrists, but it flows from deeper things.