Maybe they mentioned her weight, with the follow up of her pulling in men, because she got a lot? I know RMatS was saying it as a joke, but maybe that's exactly why. Possibly, they just found it ironic that she was pudgy and still managed to pull in a lot of men to kill. How big was she? Eh, I wouldn't look too far into it. Shows like that use the material they have, maybe the interview or bio they found didnt give a lot of "juicy" info so they had to pick at other topics to make it more interesting? Even more ironic, being about a serial killer.
Sometimes people say things that they think are minor and simple, but to other people they could be very important/meaningful in all different kinds of ways. Just depends on who's looking at it, and their experiences and trials.
Like when teenagers [kids, and people, but mainly teenagers from what I've noticed 1st hand] say "******ed" as a funny joke. A mother of a mentally chalanged child wouldn't find that very funny, but to the teenager it's harmless because their not directly talking down about mentally challenged individuals, or as a group, it's simply a joke.
Or when, again mainly teenagers, say things such as "that's so gay"... using gay as a negative.
You see where I'm getting at..
One person may see donuts as a dessert, I see them as 5lbs. haha.
To each their own opinion, to each their own view. :]
Probably didn't help anything but its 4am and I can't sleep lol, forgive me.