Once our oldest hit two months, she really started getting gassy, and evenings were always worse.
We always used Mylicon. I know some people who believe that Gerber's gas drops work better on their children, so couldn't hurt to try some of the different brands to see if one works better than another. It also couldn't hurt to talk to her pediatrician about it just to be safe.
It could be what you're eating, but since most people I know with kids have had this happen around 2 months whether they breastfed or not, I'd say it just means your child is normal.
If you're using bottles at all to feed her (if you're pumping?), then that could contribute to the gassiness too. Make sure that if you are using bottles to put some mylicon in it, and use Dr. Brown's bottles.
Just a few thoughts....good luck!