She seems to have missing links in her thought process which again could be a coping strategy to deal with the fact that she cannot accept that her boyfriend hurt her child.
It was clear from those text messages that he had been violent and was scared of what he would do to the baby. She ignored that because it's easier to ignore than to deal with the reality of it.
It's like Cold said, she attributes child abusers as monsters - those deliberately hurting children for kicks - the reality is that most children are hurt by parents who love them but just don't have the parenting ability to cope with the demands of looking after them. She will need a lot of work to help her understand what she did wrong, and still may never be able to accept it.