baby refusing bm

has anyone experienced baby refusing breast milk? my baby is 10 weeks and she’s been breastfed with an occasional bottle of formula but for the last week at certain times of the day she will refuse to drink the bm out of a bottle but will take the formula. i started giving her a bottle around two weeks and she has done fine with it and it’s at only certain times of the day. the last month i’ve been pumping and giving it to her in a bottle more than i have been latching her because she won’t stay latched and she’s been doing fine up until the last week. i don’t know what to do, i don’t wanna give up breastfeeding but it’s super frustrating taking time and pumping all this milk and her refusing to drink it and having to waste it