Have you tried changing her clothes?
It looks like her chin is in her shirt collar.
Oh, sorry, I guess I should have mentioned that yes, the problem is there regardless of what she is wearing. Thanks for the quick reply!
Well, I am using custom skins, so I suppose that could be it, though this is the first time I've seen it after months of playing with those skins. My graphics are already set to high, so hopefully it's just a one-time thing that won't start affecting my other Sims, I guess. Thanks!