She refers to herself as Miriam
My take on Miriam/Pearl is that she's a convert to Judaism (or perhaps has moved from being a more secular Jew to a more strictly observant one), and has therefore changed her name to Miriam. To her mother, who probably named her Pearl, it is probably hard to internalize that change. (I knew a guy whose name was Christopher, converted to Judaism, and during his conversion process asked that he be known only as Chris (i.e., no 'Christ' in his name any more). Upon completing the conversion, he asked to be addressed as Avrum.)
Speculation: Her actually taking a program in Jewish Studies is reflective of the importance of her (new?) faith.
All that is in aid of saying re: issue 134 - this was really, really well done -- the worry in Raven's face when she's trying to ask Erin what the hell is happening, the anticipation, etc. I can't wait to see what happens next. (Of course, my saying that kind of thing is pretty much a twice-weekly (and sometimes thrice-) sentiment. I should come up with new ways to say that.)