Trouble with sippy cups

KK

I introduced my baby to a sippy cup at 9 months. She drinks juice and water fine out of her sippy cups. I can’t get her to drink milk out of them though. She will drink

Milk out of her bottle. I even have different kinds of sippy cups but she won’t drink milk in them. I don’t know if I should get some different cups and see if that will help or what to do