Trina is definitely not a Jewish matriarch. Mister Matt, you describe her wonderfully, so I won't say any much more besides that I agree.
Marla Schaffel, to me, is a little bit too powerful. I prefer a smaller, slighter Trina. But I think that's just a personal preference.
I didn't "buy" Molina in FIDDLER, AC, but I loved him nonetheless. However, I don't think that saying you don't buy him, you're not into it, etc... is bigotry.
"I know now that theatre saved my life." - Susan Stroman