Well, unless she found out when she was 9 months pregnant, I can't quite see how she left any baby 4 months later after she discovered she was pregnant and stopped using drugs, only to find out that her partner wasn't interested in stopping too, and for her efforts she got kicked in the head for the question as to why he wouldn't give it up, too. There is a gestational period to figure in to the tale.
And recognizing each others' faults is what people do, and not wanting to deny a child knowing his/her other parent is an instinct of a person who just wants a normal family, normal love for the children and normal healthy interaction with the other adult if a family cannot be held together.
I have no reason to doubt that Crystal used drugs, gave up the drugs when she found out she was pregnant, asked Ronald to quit doing drugs too. I have no reason to believe, based on my own observation of his volatile anger toward even the minimal provocation, that he abused her when she confronted him.
As to "leaving" the child after it was born in the care of such a person, I'm sure that decision haunts her every. single. day. You try to do what you think is the right thing by not denying your children access to their father, and the carp gets thrown in your face as a bad mistake everytime you turn around. As I said.....................every. single. day. The poor woman. She continues to amaze me with working toward making better, healthier decisions.