I am so sorry that you are feeling this way. Rest assured that if you fed your baby corn mush she would still love you. If you didn't have formula, a nearby woman would help you. Don't feel that you can not come here and cry on our shoulders, we are here for you. You are a good mama and a good person. I know that it hurts to think that they are loving on that bottle when your perfectly lovely breasts are sitting there like wall flowers. That said do you want some ideas?
Are you taking a decongestent for the cold? That will impact your supply.
Are you drinking A LOT of water? Drink more.
Do you have a SNS? Can you finger feed? Maybe your daughter is not one that can go back and forth easily. You might have to feed without a bottle (PITA)
not a popular idea here on MDC, but how do you feel about solids? Dr. Jack Newman that I believe is the BEST lactation advisor out there suggests starting solids to boost weight gain in older (4+ months) babies. If you are interested, I could find a link for you. I started DS on solids at 4 months. He still nurses at least 10 a day and takes the occasional bottle of formula or EBM if I have it. But, he is still a slow weight gainer.
I can't remember if you have tried Domperidone? Would you consider chinese herbs and accupunture? That really helped me. We have the Oriental Medicine College here in Portland so the price was reasonable (but boy were those herbs NASTY)