Getting your daughter to drink milk out of a sippy cup instead of the bottle

Mom's out there I'm looking for some advice or things you did when getting your little ones to leave the bottle behind. My daughter transitioned to whole milk great but won't drink it out of the sippy. She drinks her water/juice combo from the sippy no problem. She seems to only want milk from the bottle. When I put it in the sippy she refuses to drink it. When I put it in the sippy and she fusses in her bed eventually I put it in the bottle she drinks it and falls to sleep. I know I should hold out but I worry about her not having milk. Suggestions?? Tips??