Mary would likely be the more logical way to go in this kind of context, since it's short for Maribel and that's the most common romanization. Her name's up in the air in a lot of respects, though.
I must've accidentally fallen asleep in this room.I wish Mary would've woke me up before she headed home.Ngah,Right now I'll just wash my fa-Cat-Eared RenkoHm....?What is this thing growing on me?!