B.J.
Of course she likes the taste of milk over formula--have you ever tasted formula?
There is a reason why kids are supposed to stay on formula or breastmilk for a year--their gut is truly not ready for cow milk and cow milk doesn't have the vitamins and minerals they need for brain development.
I BEG you not to keep her on milk. My SIL just took her 8mo old in for seizures...she was giving him cow milk and maltomeal instead of formula and baby cereal. His red blood cells weren't getting oxygen to his brain adequately causing seizures. Also, he was behind developmentally.
Stay on the formula. If you keep with the cow milk, you may damage your daughters brain, or stunt her development...something no mother would want for their child!