Hello M.,
My son started teething at 4 months. One day, he got really cranky and I had no idea why. He stayed cranky for about a week, and I was at my wit's end. I called my mother and she suggested that he might be teething. But I blew that off since he was only 4 months old. Well, a few days later, we were outside on the grass, playing peek-a-boo, and he opened his mouth really wide, and I caught a glimpse of his tooth. That's right! There was his first pearly-white, and I could not believe it. I didn't expect his first tooth until at least 6 months old(that's what the books say). So it is a very good possibility that your daughter will begin teething at any moment. I used Hyland's teething tabletes, and baby tylenol. When he reached 6 months of age, I used baby motrin, because it just seemed to work better, but I still used the teething tablets. Well, good luck. Just remember, when you don't feel good, whatever makes you feel better will probably make her feel better too.
K.