As the others have suggested, cows milk is fine, I to would suggest a sippy cup or drink bottle though as Marcellus said you will only have to wean her from the bottle then. Although I do understand why you would want to try a bottle. Maybe a cup like the 'magmag' cup that has a teat attachment plus a sippy attachment and straw so that when you want to wean the bottle it looks like/is the same cup but you can transition by changing the teat/sipper/straw.

I hope you find the solution that works for you soon xx