C.S.
This child's mother knows her well enough to know whether or not she needs assistance and apparently she does.
Unfortunately, she is asking for someone's time whether it be a college student, SAHM, YMCA, or child care facility, so they should be paid. Otherwise, she is asking a favor of someone. Since that is the case, is there a friend that goes to the same school who's parents can assist? Can she have a parent assist with mornings and use the after school program at the school or YMCA? Yes, she will have to wake that child up earlier than needed, but, well, basically, too bad.
Child care facilities are a good option too, although she will have to still get between the child care and the school. Some have buses or vans to transport the children and some have a person to walk them to the school. Most of them offer an income based sliding scale.
My daughter used to get herself to and from school in 6th grade (whatever age that is) and I also caught her J-walking across a major street a few times. Sahara for those of you in the area. So while we think they are responsible, they are still kids.