Caww,
Have you seen any vids where she can look up or down by just moving her eyes, not tipping her head up or down?
If she can’t, then maybe she has the condition Future Useless Eater posted here:
http://www.freerepublic.com/focus/f-chat/3472140/posts?page=1#1
....”Have you seen any vids where she can look up or down by just moving her eyes, not tipping her head up or down?”....
Yes.