Her milk won't come in all at once but should increase over time. Just makes sure she eats and drinks plenty. If she's being picky, liver is really good for them and if she isn't drinking much water, let her have some goat's milk. Ice cream, boiled chicken, canned food and yogurt can sometimes get their appetite going. Don't expect an immediate turnaround but things should get better.
Hang in there...you're doing great!!