I had the same problem with my first for the first couple of weeks. Could hardly even pump a drop. Very frequent nursing (every 2 hours or so), lots of rest, lots of fluids, and trying to diminish stress (particularly stress about breast-feeding!) increased milk levels.
When you say that your baby is crying all the time because she is hungry--how often is she wanting to nurse? Every couple of hours (12 times a day, for up to 30 minutes a nursing session) is normal for a newborn, even if your wife's milk supply is sufficient. Make sure that your wife offers both breasts during each nursing session, and that your daughter is taking the whole nipple into her mouth, so as to properly compress the milk sinuses.
Fenugreek is often recommended as an herbal supplement to aid in milk production, but I don't know if it's easily available here. Oatmeal is also said to help.
And try to relax. If you and your wife are worried about it, it is going to affect her supply, and the baby will pick up on the anxious cues as well. Give it time. And congrats on the new wee one.