Just a reference for you, there are a couple of examples of the Female ODSTs in some of the books. They are always described as wearing the standard armor. In fact, in the Helljumpers graphic novel the female NCO wears basic ODST armor just like everyone else, hers isn't even modified for a more feminine frame, it's just smaller for her smaller size. I would suggest just resizing the actual armor files and using them. There may be a few small tweaks you can do to feminize it but in all honesty, it's supposed to be (like the original Mk V armor) unisex.