You do not have to be 'qualified' (exams?, academic study?) to become knowledgeable on any subject. Many is the person who has become an expert in their field just by reading about it extensively, talking to those involved and thinking about it. The classic example is the late Sir Patrick Moore whose astronomical knowledge was entirely self taught.
I pay this MP the courtesy of assuming that this is what she has done. When you see the really stupid things the 'experts do and say (teachers, Social workers etc etc), like the disruptive boy whose teachers and head teacher locked him in a small room by himself for 40 minutes, I think this MP is as likely to talk as much sense as any expert. Since she doesnt come from within the system, she may be more likely to think outside the box and say what others wont say because it might affect their careers.