4 y.o. Been vomiting for 48hrs now. She has a big boak, sleeps for a few hours, wakes up starvin. I feed her (so far have tried toast, watermelon, yougurt, custard and vanilla ice cream, not all at once of course but nothing stays down) . She then boaks again, perks up chats, then sleeps. Wakes up, then we start all over. She is so hungry, but nothing stays down. What else can i feed her that might stay in her stomach?