Fussier with cows milk

Chi

Hello! So my daughter turned 1 on the 30th and so I started trying to transition her to cows milk with half her formula and half milk. Then I started doing just cows milk and she’s a lot more fussier and waking up in the night wanting to eat on the 2/3 hour mark when before she would sleep the whole night. Should I go back to formula and cows milk mixed?? Her 1 year appointment isn’t till the 18th so I’m a little confused. Has anyone experienced this??