A year old and vomiting at night

My daughter will be a year early next month. I posted awhile ago wondering why my daughter might be vomiting and most people said it was because she caught the flu that her brother had. Well its been a week now and she doesn't show any signs of the flu besides throwing up at night. I always lay her down with a bottle so i am wondering if it has to do with that because I just put her down for a nap and the same thing happened. No fever, just throwing up in bed.