S.D.
You have to think about why you're weaning her this early, and is it worth it? Are you having trouble breastfeeding, are you going back to work, do you want a lifestyle change? I'm not trying to make you feel guilty at all- four months of exclusive breastfeeding is wonderful!- but the AAP recommends exclusive b.f.ing for at least 6 months. If your daughter is rejecting the formula, it may be better for her and you if you wait a couple more months. She'll be older and she won't need as much of the antibodies, etc. that your breastmilk provides. You also may be able to give her some baby food by then, which will help her transition. Two months isn't that long. :-)
Switching feedings during the day first is usually the best. Most babies like to nurse when they wake up and when they go down for a nap or for the night. "Comfort feedings" are hardest to drop, and your baby needs them to feel secure.
Refusing to give her your breast when she rejects the bottle is a bad idea. Your baby doesn't understand why; she just knows she's hungry and Mommy won't feed her. That will only make things worse. Have you tried giving her a little breastmilk (like 5-10 minutes) and then leaving the room (or even the house!!) and letting your husband feed her? That way she's not upset from hunger so she may be more likely to accept the bottle.
Have you considered pumping exclusively? That way she'll still have your milk while getting accustomed to the bottle.
When my daughter was four months, she was just getting the hang of breastfeeding. It took her a long time to get latched correctly, etc. I had to use shields and everything. If you're weaning because of the difficulty, I promise it gets easier!
You could visit a La Leche League meeting and have access to lactation consultants. They may be able to help you with transitioning. I love the one that meets in Grapevine.
Hope that helps? :)