1) It could be that your baby isn't latching on well when nursing so she sucking in air while feeding, so her tummy is filling with air as well as milk. Check that.
2) The gas could be caused by your diet. I know some babies are sensitive to cows milk, if their Moms are drinking it or eating a lot of dairy, this causes them (the baby) gas. You might try eliminating dairy from your diet for a week and see if this makes a difference. Take a look at your diet and see if there are any other potential 'gasy' foods, like broccoli, cauliflower, ham, beans. Look at eliminating them.
3) The Mylicon drops can be very effective. I have a nephew who was the most colicky baby ever, and when he finally got the drops it made all the difference in the world for him. His Mom also dropped dairy from her diet.
4) Use a warm hot water bottle to prop your baby on their side when sleeping. The warmth will comfort them and help with the cramping they are experiencing. If not a hotwater bottle, a bucky pillow that you have put in the microwave for about a minute to warm the contents, no risk of a leaking hot water bottle.
5) You can also bicycle your baby's legs when changing diapers or playing with them. Physical movement helps to move things through the digestive system and you may find yourself playing a little horn with all the toots that will follow.
I wish you well. It's difficult for parents to watch and hear a baby in pain because of what comes naturally, eating.
You might want to call a lactation nurse to see how your baby is latching on for feeding. Just another thought. Take good care!!!