My 6 month olds upper respiratory infection... still vomiting?

The rule of thumb with infant/child vommitting is to not give anything to "eat" (formula) until they have not thrown up for 12 hours or more. I would give the electrolyte water in SMALL doses, teaspoon at a time, until she holds down the liquid. Formula has milk it it, which upsets stomachs easily when sick. I would also make sure you suck her nose out with a bulb syringe, this will keep the snot from going down the back of her throat-which may be causing the cough and the throwing up. Rub her chest with a small amount of warmed olive oil, a firm mage on her chest and back will stimulate the immune system and make her feel better. Also, keep a vaporizer in her room when she's sleeping so the air is nice and moist to break up any mucous. Sometimes it helps if they can sleep in an upright sleep position, perhaps keep her in a carseat or prop her on a pillow. This will ease her breathing.