Hi, Serena!
B. here, a trained doula and mom to 2. My advice to you is NOT to rush the cow's milk. At 9 months, your dd's system is simply NOT ready to handle the complexity of cow's milk, most especially in the volume she would intake if you were to replace her formula with it.
Pediatricians now recommend that any cow's milk be whole milk from a cup after the first year and until the child is at least 2 years of age. This ensures that your child receives enough fat, which is essential to proper brain development. After the age of two, if growth is good, you can switch to low-fat or nonfat milk. Note: If your child is nursing, then remember that mom's milk is "whole" milk - the more breastmilk your child gets, the less need to worry about your child getting additional fat from whole milk or other sources.
As to your daughter's aversion to her formula -- Have you changed her brands recently? Also, here's a tip: Give her formula in a sippy cup while you eat dinner and she picks at soft finger foods. (At 9 months, that seems perfectly acceptable) Maybe she'll like the novelty of it being in a different container, and want to drink more.
Here's another link for you, pertaining to feeding 7 to 9 month olds, from the great (but never late!) Dr. Sears:
http://www.askdrsears.com/html/3/T030600.asp
Take Care!