Here is the IMDB picture of the acress, Jenna Berman...
While she does have a somewhat long neck, it's not freakishly long or anything. I think the neck seal just accentuated it in the above picture. You also may notice that it looks like she's wearing the cod piece really low. That's most likely because it wasn't built for her in the first place. Since these were re-used from Delivering Hope, they don't fit the new actors perfectly.
@Brynna: You're doing an incredible job with this so far. I'm always amazed to see quality foam work. And you're right to point out that it looks like a "wonky ODST plate" since it is, in fact, an upside-down ODST center stomach plate. If you notice, Fred was also wearing an ODST piece for his stomach plate, an ODST butt plate.
Keep up the good work!
Holy cow she's tiny, no wonder she looks like a toddler in that suit.