Milk/bottle advice

My daughter will be one on March 11. Lately she is refusing formula in both bottles and sippy cups during the day. She will only drink an ounce here or there throughout the day when offered and usually when she does actual drink it, it's in a sippy at mealtime. She is an excellent eater with any and all foods and drinks water well. At night and in the morning she nurses. I have not tried giving her cows milk yet, but I'm thinking I will buy some whole milk next week and see if she will drink it. Even though she is not quite one yet, do you think I could go ahead and follow her lead and stop giving her formula? I plan to continue letting her nurse for a while yet. What would you do?