I gave my daughter a sippy less than half way filled with milk to see if she would drink it and now…

I gave my daughter a sippy less than half way filled with milk to see if she would drink it and now she won't drink formula. She refuses to drink formula and would rather have regular milk. I tried mixing her formula with milk and nope she wants just milk. I know at 1 she's suppose to be transitioned and she's turning one in 19 days so it's fine. That was such an easy transition for me. She did it basically all by herself.