Hiya.
It does sound like a nursing strike. Was your baby startled at the breast (did you jump when she bit down or make any sudden movements while she was nursing?) or have you recently changed laundry detergents, lotion, soap, deodorant, etc.? Has she recently had an ear infection or a cold (Congestion can make breathing difficult while nursing.)Any of these can contribute to a nursing strike.
Check out kellymom.com or the La Leche League website -- they should be helpful. Keep in mind that your baby's digestive system is still too immature to process a lot of food (see Dr. Sears' website -- askDrSears.com) and your milk is the perfect food for your baby for the first year.
One thing you might try is relaxing with your baby in a warm bath. Some babies take the breast when they are partially submerged in warm water. Just make sure you are not too tired when you are in there so you don't fall asleep in the tub -- maybe do it when someone else is in the house and can check up on you every few minutes.
Whatever you do, keep your milk flowing to maintain supply and prevent engorgement. Use the milk you pump with a feeding syringe, spoon, or cup to prevent nipple confusion or a bottle preference from occuring.
The following information is from the Kellymom.com site which has proven to be a very helpful and reliable website:
When babies abruptly stop nursing, it's a nursing strike - not weaning. Babies rarely wean on their own before 18-24 months, and self-weaning is almost never abrupt.
Will baby nurse while asleep or just waking up? This is usually one of the best times to try. You also might try nursing lying down or while walking around. See also the tips at the top of this page for persuading baby to nurse.
As long as baby is not nursing as often as before, you'll want to express milk to maintain your supply, stay comfortable, and reduce the risk of plugged ducts and mastitis.
Don't miss the great links below about nursing strikes.
Surviving A Nursing Strike by Becky Flora, IBCLC
Is Baby Weaning or Is It a Nursing Strike? by Nancy Mohrbacher
Nursing Strike FAQ from LLL
Nursing Strikes by Cheryl Taylor White
Nursing Strike FAQ from Misc.kids
Articles on Nursing Strikes from the LLL magazine New Beginnings
Chronicle of a 40-day Nursing Strike by Tane Tachyon. Also includes additional info and personal stories about nursing strikes.
I hope this helps. Good luck!
S. :)