Hiccups are normal, especially for newborn babies. They are nothing to be concerned about! I wouldn't give medicine (mylicon) for hiccups...that's not its intended purpose, and the hiccups aren't hurting her - they'll go away on their own! Lots of babies hiccup in the womb, too. It's nothing to worry about :-) With breastfeeding, your daughter will eat until she's full, so there's no need to give her more or less than what she eats on her own. Congratulations on your new baby!!
I just looked it up in "What to Expect the First Year" and here's what it says:
Some babies aren't just born hiccupers, they're hiccupers before they're born. And chances are, if your baby hiccuped a lot inside of you, he'll hiccup plentyin the first few months on the outside, too. But a newborn's hiccups, unlike the adult variety, don't have a known cause. They are believed to be another of baby's reflexes, though they're frequently triggered by giggling later on. And also unlike adult hiccups, they're not bothersome, at least not to baby. If they are to you, try letting your baby nurse or or suck on a bottle of water, which may quell the attack.
Hope that helps!