K.,
My son napped for 1/2 hr at a time, every two hours, too. He's go down 5x/day. It is maddening, I know. Unfortunately, there was nothing I could do to change it. I could rock him, nurse him again, try letting him cry, not one thing worked.
Eventually, he slowly consolidated his naps on his own. By 7 months or so, he was napping twice a day, for an hour in the morning, and then an hour and a half in the afternoon. It takes babies longer to organize their sleep patterns during the day than it does to organize night sleeping. If she's sleeping well at night except for feedings, then you're on the road to improvement. A baby's sleep patterns are to sleep for 30-45 minutes at a time, rouse, and then fall back to sleep. She's not gotten the hang of going back to sleep during her nap yet. She will, it just takes time, and brain maturity. She'll get there. By a bit past one year, my son was down to one nap a day, for two and a half hours, off to sleep on his own. He is 2 yr, 4 mos, and still naps the same way. Considering the time it takes for him to fall asleep, I get three hours to myself in the middle of the day! You guys will get there too, it just takes time for some babies.
Jess