Refusing bottle

Kacey

My 4 month old is breastfed but I was giving her a bottle of like 2oz of my breastmilk to top her off before bedtime hoping she would sleep longer. The past week she absolutely refuses a bottle and will scream and just want the boobie. I have to go get a cavity filled next month so she will have to have a bottle while I’m gone and this worries me. Could the nipple flow be wrong? Anyone else been through this?