my youngest did the same thing. she just turned a year in april, but she refused baby food just a few weeks after trying it.
i agree with the other poster(s) that mentioned breastmilk or formula is all baby REALLY needs for the first year. if baby still seems hungry (after nursing or bottle), try table food. my daughter started with mashed veggies - whatever we were having for dinner, really - and moved to noodles soon after. bananas and peaches are good smashed up, too.
don't worry if she doesn't want regular food, either. as long as she's developing (gaining weight and whatnot), i wouldn't worry.
and if you're really concerned about the pediatrician's lack of concern/help, maybe you could try a new one? just something to think about. i know it's starting over and a new one doesn't know your daughter, but if it'd help put you at ease, maybe you should.
good luck!