Congratulations on your new baby!!
There are a few things you can do that might help. How often do you burp her? Some babies do much better if they're burped mid-feed, and afterwards as well. Also, different babies like different styles of being burped--some you barely have to rub their little backs, and they give you a good one, and others like a bit more of a vigorous pat. Some like to be burped high up on the shoulder, others like to be sitting.
I don't find that it works for my little guy to bicycle his legs, but some parents swear it really helps their lo's release gas. What works well for my guy is tummy time, actually. Sometimes no matter how many different burping positions I try, he just won't, and then as soon as I lay him on his tummy, he lets a good burp out.
So, it's just a matter of trying different things to see what works best for her. And keep in mind that most babies have a hard time releasing gas in the early weeks (and months), but as their systems develop it gets much easier.