So, essentially your issue boils down to: "man, why do so many of her chicks have huge tits! I'm tired of it." Okay. Well, again, some of us love the fact she enjoys and draws milfs with very large breasts...
Of course, could there be yet more variety to the way Glassfish draws bodies? Like some women having smaller bodies, smaller breasts, butts and thighs? Sure. But would I personally look forward to it? Hmm. No. I guess Glassfish likes 'em thick. I don't see a problem with it. Also, it's weird that you think the heads and arms she draws can look disproportionate. Looking at her recent work I don't see anything remotely close to it. I could be off, but I doubt it. (If you want to show an example, feel free.)
She is, without doubt, one of the better western ss artists out there. At this point, I'd say she's easily up there with artists like pbx. (I woudn't have said so when she started, but now? Definitely.) Glassfish's comics have been great; have you seen her Mrs. Claus and Bayonetta work? Her layout's have been excellent in each. Crappin' on the work of a kick ass artist (and by the way, how many good western artists are out there doing ss? You can count them on one hand) because they tend to do women of a certain size is... funky.