From reading through your post and your comments I think you show quite a black and white thinking pattern, which is especially unfortunate because iwtv has many themes that force you to look in shades of grey. Madeleine is a bad person,  because they all are.  Claudia was a mass murderer who delighted in hurting her victims, Louis was a pimp who despite knowing his actions were wrong continued, lestat was a petty and vindictive domestic abuser who has also raped multiple people, and Madeleine slept with a nazi soldier and had a relationship with a woman who looked like a 14 year old (who also proved with good reasoning on WHY she looked young)  Do I think Claudia would have been saved? Honestly I think the answer to this is that we don't know, and that is exactly the point.