She indirectly causes dysfunction in the family because Biff and Happy see their father as someone who should be successful, but he only has dreams he can never achieve, and Linda just helps him. Miller is trying to tell us that we shouldn't let people be someone they're not, and that we should tell it like it is. If we don't do this, dysfunction will occur. So if you ever see someone enabling someone else, try to stop it. They may be trying to be kind but they are only hurting the person they are supporting, because everyone should live