Weaning formula

So my daughter still drink a lot of formula. She has about 25ish oz a day. She eat for the most part 3 meals a day and some days snacks here and there. She has a milk protein allergy so she isn't getting whole milk obviously. Should I try finding her a milk alternative and make one of her bottles of that? How did you start weaning from the bottles. I'm afraid of taking them away cold turkey because she still drinks so much she clearly wants it.