If she was Afghani, it probably would have said in her profile that she was South-west Asian instead of Caucasian in her NamUs profile, wouldn't it?
Regarding JTR, I forgot about the Goulston St. graffiti until you mentioned it. There were some witness statements from people who saw [I think] Elizabeth Stride and Catherine Eddowes with a man, who for some reason or another, the witness thought looked "Jewish" that was later changed when reported by the press as "foreign looking."
With regard to Beth Doe, personally I don't think that she's from that far away [this is JUST my opinion, I could be wrong]. I think she's probably of Italian American origins (there are a lot of Italian Americans in PA), she got pregnant to someone he's married or otherwise engaged. Maybe she and his wife got into a fight, Beth got killed, and either the body was too heavy for that person to carry intact or they needed to get it out without the neighbors seeing it or something like that. The killer could have been jealous of Beth, thinking that she had a better bust line, nose, and ears than her or she could have been thinking something along the lines of "no one will ever look at her again and be attracted to her if I mutilate her," or maybe there was something notable about her breasts (implants with serial numbers?), nose, and/or ears and one or more was additionally cut off to confuse investigators. I think Carbuff is right that the suitcase wouldn't zip because of her breasts, if this was done by the baby's father's wife. I hadn't thought about that before, but it makes sense if she was cut up to be easier to transport.