Do you breast feed? Sounds to me like she isn getting enough hind milk, if you are breast feeding she should mostly only have one boob each feed to make sure she gets down to the thick stuff that will keep her satisfied. I breast fed and used a dummy, i hated them too but as a single mum with a crying daughter that was quiet with a dummy, i wasnt going to say no, we stopped it at 18months by chopping the ends off, but if i were you i would stop them now and just make sure you only feed her every 4 hours then she will get a proper feed each time x
This is not the case for most people I know. I've always bf by babies cue and both boys nursed from both sides per session...I bf them both well past the first year without any troubles. She should be able to tell by the bowel movements if the baby is getting enough hindmilk. Babies have a strong desire to suck and I know plenty of moms (who introduced) that dealt with this issue.
ETA- I agree with the pp about not trying to schedule feedings and go by her cue. BM is easily digested and most bf babies at this stage eat every 2 hrs. Perfectly normal and does not last forever. Feeding a newborn every 4hours (a bf one) is not a good idea!