I always did milk before solids until a year old. I was doing it wrong at first but had a lactation consultant tell me that it was very important to do milk first. Part of that is because I was breastfeeding (to keep milk supply up), so that wouldn't apply to bottle feeding. But the main thing was that you want baby's primary source of nutrition to be breastmilk or formula and not the solids. If they fill up on cereal they don't get the nutrition they need from the milk/formula. I did solids about 20 mins after milk, so as not to space them apart too much.
Now, I don't know if that is going to make a difference to help keep her from spitting up. Mine never really spit up. My nephew spit up like crazy until he was a year old, and nothing my sister did really changed that except time. Formula first or food first didn't make a difference. His wasn't reflux, just an underdeveloped valve, and it went away on its own when he outgrew it.
Good luck!