You can first put her food right on top of the paper towels. She'll probably explore it but not need to eat for a while. The biggest risk of putting a plain water dish in the brooder is that the chicks are drawn to the water, and walk through it, sometimes fall in and drown. You can work around this by using a shallow saucer, and putting a custard cup or other small bowl upside down in the middle, so there is just a bit of water around the edges for them to drink from. I usually put a ring of marbles in the dish, so they don't try to sit in the water. They'll sip the water from between the marbles. I'd not open that incubator until all of the chicks that are going to hatch, have actually hatched and dried off. You run more risk of damage to those other chicks by opening the incubator to take out the first baby. Best policy is: hands off that incubator until they all have hatched!