BRAT diet (Bananas, Rice, Applesauce, Toast) when she's able to eat.
Ginger is a good one, if you go with Ginger Ale, be sure it's a brand that has actual ginger in it, apparently they don't all and give it a stir to remove the carbonation. If she's loosing a lot, be sure to watch for signs of dehydration. A drink like pedialyte is a good suggestion too, as it will help keep dehydration at bay better than just water. White Grape juice is good too, I was told not to give applejuice by a nurse as it can encourage diarrhea if the tummy is upset, although I know a lot of people give it and say it's not an issue. I was told White Grapejuice is better as it doesn't have that effect and kids love it.
I hope you little on is better soon. It's just awful watching them when they're sick, it's such a helpless feeling and so sad to see them like that. Sending healing thoughts your way...