I got her into UE4 and started up on her materials. I'm pretty happy with her skin thanks to this awesome post by Dzung Phung Dinh https://80.lv/articles/secrets-of-human-shaders-in-ue4/
When i got to her eyes i was not happy with the state of the texture, it been low res and went away from my original concept.
I decided to give the eye a separate texture, keeping it low res at 256. Kingdom hearts 3 came to mind when i was painting the eyes again and I realize that how they did highlights and reflections in the eye was pretty similar to how i wanted.
I got the eyes diffuse to a point im pretty happy with my only problem was in UE4, I was having trouble getting the highlight to mirror onto the other eye. I'm still not sure exactly why it wont mirror across(their the same UV's) but I think it has something to do with how UE4 does lighting.
After spending sometime watching trailers and gameplay of various UE4 games i decided to try out creating extra geo just above the eyes and making a mask.I found this gave me a lot more control over the shape and detail of the highlight. I then also add a Fresnel mask to the opacity mask to give the illusion of the light shining when the camera or eye moved.