A couple of questions related to your gas probs: Does your daughter seem upset when she passes gas? When you say she can clear a room, I assume you mean it stinks? Does she have any other symptoms, such as persistent rashes (anywhere?), sleep disturbance, chronic diarrhea or constipation, general constant crankiness, etc...?
Sometimes babies ARE just loud farters, and if they don't seem upset by the process, it couldjust be a quirk. However, stinky farts in an exclusively breastfed baby can indicate some food intolerance. If gassiness is accompanied with any other symptoms, or discomfort is associated with it, there is a good chance of intolerance.
La Leche League books and Dr. Sears' books have good information on what foods are most commonly responsible and how to test them. In general, dairy seems to be the number one problem with all of the women I talk to. Most of them can introduce dairy into their diets again when their baby is older. Soy, corn, citrus, nuts and wheat are all on the lists, too, and are good to try taking out if dairy isn't the culprit.
Most moms find it works best to use a trustworthy book to help when they take a food out, bc they may not know all the ways that it can be snuck into foods without being overt (lactose, casein, whey, etc...), and if they don't know that, they can inadvertently still be eating them. Also, good info can help them find other foods without just substituting with fake foods (like suddenly going completely soy everything) that can cause their own problems.
I know it can sound terrible to take a food out. You do get used to it, though!