Girls, hello, please give me advice! I'm going to be away from work fo…

Girls, hello, please give me advice! I'm going to be away from work for one day soon, from 9 am to 6 pm, and now I'm in a lot of thought about what to do with breastfeeding my daughter. She's on GVB (breastfeeding), but I will leave the expressed milk, of course. But according to my calculations, one feeding will have to be replaced with formula, but she has never taken formula before, I don't know how to be, will it affect her body? Will she drink this formula? What kind of formula should I get? Won't she refuse it later? ? head all over