if you mean her texture or skin looks plastic, then the answer is skin shaders and look at a lot of the posts by bagginsbill (who is developing a commercial uber-shader) at here and RDNA in the Node Cult forum.  also, face_off's RSS works with a tweak.  if you're useing D|S, get pwSurface, it's worth it.

if you mean her face and body shape look plastic, then there's  few options. V4 has more realistic bending and proportions, but way less definition and facial realism than V3.  she shows an obvious A3 heritage, especially in places like her knees and elbows.  or her back, where she has no shoulder blades, even though you can see ribs on her chest between her breasts.  looking at her eyes, there are some really basic and obvious flaws V3 doesn't have, and i've yet to see a morph that corrects them.  bagginsbill is presently having problems with her eyeballs, and i think they just need to be replaced.   Alice by Aery Soul and (iirc) Sensational SuperStar Vickie have more defined  bodies, but both have a very definite appearance.   and they basically make thinner characters, instead of just giving her a more accurate shape.  you can use Alice with V4's morphs, but she never stops being distinctive rather than a basic, fairly neutral detailing.

that's not a criticism of Alice, because she's supposed to be distinctive. it just means she's not a silver bullet.  and not sold, presently.  she might be re-released for XMas, but AerySoul pulled her from market already.

at this point, i've seen lots and lots of people (including myself) and merchants try, but i think her face is a wash.  she's my least realistic modern non-stylized figure in that regard.  you'll notice that textures with lots of make-up look more realistic.  it's because they hide the glaring problems with her eyelids that help make her look like a doll. not entirely hide, but help.