PLEASE HELP baby won’t eat formula

Emma • 💑 Tatum Rae born Feb. 6, 2018 👶🏼🎀🌸💗 insta: @e.noble

My baby just turned 4 months and she’s eating so much breast milk that I can’t keep up. I had 100 6oz bags of breast milk in the freezer about 2 months ago now i have 8 bags left. I pump because she refuses to breast feed i’ve tried every thing. I pump every 2 hours and get about 5oz total each time. I decided I would try to supplement with formula so i tried it and she refuses to drink it. She hates any type of similac and enfamil. I’m getting really worried. She has a doctors appointment tomorrow so i’ll ask then too. But I was just wondering if anyone had any tricks on how to get their baby to start drinking formula :/ I’m really desperate.