If you're in Chapter 1, defeat enemies and let Ava feed on them. Eventually you'll be told to return to Storage Room 1A.
If you're in Chapter 3, visit the Genetic Synthesis lab in the Xeno wing and follow the quest.
Hope that helps!
yes i couldent feed her enemies anymore and thout i missed something could you add something so we can see if we got everything from an area before we leave and cant come back (like a page where you see x clothes /x wapens in this area ?
