A.H.
Hi S. -
My pediatrician suggested gradual taste introduction of formula, and it worked like a charm. For the first few days, I made a bottle of 2/3 breastmilk and 1/3 formula (which my daughter sucked down without question). Then I gradually increased the amount of formula until I was not supplementing at all with breast milk. Since your daughter doesn't take bottles, you can just mix the formula in the sippy cup first and then add pumped breast milk. Of course, you will need a pump to be able to try this. Manual pumps are pretty inexpensive if you don't already have one.
The other option is to continue nursing her until a year and then move to regular or soy milk (if her allergies will permit it). My daughter took regular milk fine as long as I warmed it first.
Well, hope this helped...
A.