I can understand your feel cox I walked through all this.. be patient and continue to try to latch on for your baby although is pain.. use your milk to apply at your nipple after feed, can cure the nipple crack problem. If you stop bf her, the supply will stop, so keep trying, i believe your supply will increase.. eat more fish.. drink more soup.. try to press her chin gently to make her mouth open bigger.. or use two finger to press your breast to make your nipple smaller to put into her mouth..
i also feel pain at start n confused y ppl said will not feel pain one if proper latch on, but, is true, at 1st i feel the pain so much, but after few weeks/a month, after getting know how to latch one after keep trying n trying, will not feel pain after you get through all these..
Give her formula after you bf her if she still ask for milk.. is ok one.. when your supply more n more, then only cut down the formula.. which i tried before as well..
remember not to give up as mother milk is the best for your baby.