The version of Maria mentioned in this topic is the god-like one playable in NitM. I don't think that she could be sacrificed due to the fact that she would have to be captured first and only Death or the controlled Richter would be capable of that and it wouldn't be easy for them. Besides, why sacrifice her when she is that powerful? If Shaft could control Richter, why not control Maria too, if she is that powerful. She would be a better "guardian" than a sacrifice. Plus, unless I'm mistaken, the offering only requires a virgin girl to be killed. So a ordinary girl from a village would do.