Devils advocate here.
So I guess, MAYBE if we stretched things REALLY thin, you could go with Ripley (typing that made me feel ill)...but why on earth would you add Newt? Adult or not she doesn't make ANY sense at all.
If you told me Ripley and Hicks came out of two pods I'd still tell you it was stupid, but it'd make more sense than a (suddenly) adult version of Newt.